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achlorhydria [ā΄klôr hī′drē ə] n. 〚ModL: see A-2 & CHLOR- & HYDRO- & -IA〛 a stomach disorder in which the stomach fails to secrete hydrochloric acid achlorhydric ...
See achlorhydria. * * *
/ay klawr'euh fil"euhs, ay klohr'-/, adj. Bot. containing no chlorophyll. [A-6 + CHLOROPHYLLOUS] * * *
▪ people also spelled  Acoli , also called  Gang  or  Shuli        ethnolinguistic group of northern Uganda and southernmost Sudan (Sudan, The). Numbering more ...
—acholic /ay kol"ik/, acholous /ay koh"leuhs, -kol"euhs, ak"euh leuhs/, adj. /ay koh"lee euh/, n. Pathol. lack of a secretion of bile. [1840-50; < Gk áchol(os) lacking bile ...
—acholuric, adj. /ak'euh loor"ee euh/, n. the absence of bile pigments in the urine. [1900-05; < NL < Gk áchol(os) (see ACHOLIA) + NL -uria -URIA] * * *
A·cho·ma·wi (ə-chōʹmə-wē') n. pl. Achomawi or A·cho·ma·wis 1. a. A Native American people inhabiting northeast California. b. A member of this people. Also called ...
—achondritic /ay'kon drit"ik/, adj. /ay kon"druyt/, n. a meteorite containing no chondrules. [1900-05; A-6 + CHONDRITE] * * * ▪ meteorite  any stony meteorite containing ...
See achondrite. * * *
—achondroplastic /ay kon'dreuh plas"tik/, adj. /ay kon'dreuh play"zheuh, -zhee euh, -zee euh/, n. Pathol. defective conversion of cartilage into bone, esp. at the epiphyses of ...
See achondroplasia. * * *
/ah chooh"/, interj. ahchoo. * * *
/ak"roh uyt'/, n. the colorless or white variety of tourmaline, often used as a gem. [ < Gk áchro(os) colorless (a- A-6 + -chroos colored) + -ITE1] * * *
/ak"reuh mat'/, n. See achromatic lens. [1905-10; by shortening] * * *
/ak"reuh mayt'/, n. Ophthalm. a person unable to perceive color. [back formation from ACHROMATIC] * * *
—achromatically, adv. /ak'reuh mat"ik, ay'kreuh-/, adj. 1. Optics. a. free from color. b. able to emit, transmit, or receive light without separating it into colors. 2. Biol. ...
achromatic lens
Optics. a system of two or more lenses that is substantially free from chromatic aberration and in which the lenses are made of different substances so that the focal length of ...
achromatic prism
Optics. a system of two or more prisms of different substances that deflects but does not disperse a beam of light. * * *
See achromatic. * * *
/ak'roh meuh tis"i tee, ay'kroh-/, n. Optics. achromatism. [1835-45; ACHROMATIC + -ITY] * * *
achromatic lens n. A combination of lenses made of different glass, used to produce images free of chromatic aberrations. * * *
achromatin [ā krō′mə tin] n. 〚 A-2 + CHROMATIN〛 Biol. that material of the cell nucleus not easily colored by the usual stains, including the nuclear membrane, linin, ...
See achromatin. * * *
/ay kroh"meuh tiz'euhm/, n. Optics. 1. freedom from color. 2. freedom from chromatic aberration, as in an achromatic lens. Also, achromaticity. [1790-1800; ACHROMAT(IC) + -ISM] * ...
—achromatization, n. /ay kroh"meuh tuyz'/, v.t., achromatized, achromatizing. to make achromatic; deprive or free of color. Also, esp. Brit., achromatise. [1835-45; ...
/ay'kreuh mat"euh fil, ak'reuh-, ay kroh"meuh teuh-/, Biol. adj. 1. Also, achromatophilic /ay'kreuh mat'euh fil"ik, ak'reuh-, ay kroh'meuh teuh-/. having little or no affinity ...
/ay'kreuh mat'euh fil"ee euh, -feel"yeuh, ak'reuh-, ay kroh'meuh teuh-/, n. Biol. the property of having little or no affinity for stains. [ACHROMATOPHIL + -IA] * * *
/ay kroh'meuh top"see euh/, n. Pathol. color blindness (def. 2). Also, achromatopia /ay kroh'meuh toh"pee euh/, achromatopsy /ay kroh"meuh top'see/. [A-6 + CHROMAT- + -OPSIA] * * ...
/ay kroh"meuh teuhs/, adj. 1. without color. 2. having little or inadequate color; lighter in color than normal. [ACHROMAT(IC) + -OUS] * * *
/ay kroh"mik/, adj. colorless; without coloring matter. Also, achromous. [1755-65; A-6 + CHROMIC] * * *
/ay kroh"meuh bak'teuhr/, n. Bacteriol. any of several rod-shaped bacteria of the genus Achromobacter, found in soil and water. [ < NL < Gk áchromo(s) colorless (a- A-6 + ...
/ak'roh muy"sin/, Pharm., Trademark. a brand of tetracycline. * * *
/ak"seuh/, n. the daughter of Caleb who was promised in marriage to the conqueror of the city of Debir. Josh. 15:16-19; Judges 1:12-15. * * *
Achterberg, Gerrit
▪ Dutch poet born May 20, 1905, Langbroek, Neth. died Jan. 17, 1962, Oud-Leusden       Dutch poet whose use of surreal (Surrealism) language and imagery influenced a ...
/ahkh"toong/, interj. German. attention. * * *
—achiness, n. /ay"kee/, adj., achier, achiest. having or causing an aching sensation: an achy back. [1870-75; ACHE + -Y1] * * *
/euh sik"yeuh leuh/, n., pl. aciculae /-lee'/. 1. a needlelike part; spine, bristle, or needlelike crystal. 2. a pl. of aciculum. [1875-80; < NL, LL, alter. of acucula ornamental ...
—acicularity /euh sik'yeuh lar"i tee/, n. —acicularly, adv. /euh sik"yeuh leuhr/, adj. 1. needle-shaped. 2. Metall. a. (of cast iron) containing ferrite in a needlelike ...
/euh sik"yeuh lit, -layt'/, adj. 1. having aciculae. 2. marked as with needle scratches. 3. needle-shaped; acicular. Also, aciculated. [1830-40; ACICUL(A) + -ATE1] * * *
See aciculate. * * *
/euh sik"yeuh leuhm/, n., pl. aciculums, acicula /-leuh/. 1. an acicula. 2. Zool. one of the slender, sharp stylets embedded in the parapodia of certain annelid worms, as the ...
—acidly, adv. —acidness, n. /as"id/, n. 1. Chem. a compound usually having a sour taste and capable of neutralizing alkalis and reddening blue litmus paper, containing ...
acid and basic rocks
Division of igneous rocks on the basis of their silicate mineral content, these minerals usually being the most abundant in such rocks. Rocks are described as acid, ...
acid anhydride
Chem. See under anhydride (def. 1). * * *
acid cell
1. Elect. a cell using an acid electrolyte. 2. See parietal cell. * * *
acid drop
Brit. a tart candy, as a sourball. [1830-40] * * *
acid dust
air-polluting particles of dust, usually wind-borne, having high concentrations of acid. [1975-80] * * *
acid dye
Chem. any of a class of dyes containing one or more acidic groups, as the sulfo group: used in acid solution chiefly for dyeing wool and silk. [1885-90] * * * ▪ chemical ...
acid halide
▪ chemical compound       neutral compound that reacts with water to produce an acid and a hydrogen halide. Acid halides are ordinarily derived from acids or their salts ...
acid house
Chiefly Brit. a style of disco music marked by heavy bass and synthesizer rhythms, often associated with the taking of LSD and MDMA. [1985-90] * * *
acid house parties
➡ acid house * * *
acid jazz
n [U] a type of dance music, popular in the 1990s. It is a mixture of soul, jazz and hip hop styles. Groups such as Incognito and the Brand New Heavies are typical of the style, ...
acid metaprotein
Biochem. a metaprotein derived by means of a hydrolytic acid. * * *
acid number
Chem. a number expressing the acidity of a substance, equal to the number of milligrams of potassium hydroxide needed to neutralize the free fatty acids present in one gram of ...
acid phosphate
Chem. superphosphate (def. 1). * * *
acid precipitation
meteorological precipitation that is relatively acidic. Cf. acid rain. [1975-80] * * *
acid radical
Chem. the remainder of an acid molecule after acidic hydrogen has been removed. * * *
acid rain
precipitation, as rain, snow, or sleet, containing relatively high concentrations of acid-forming chemicals, as the pollutants from coal smoke, chemical manufacturing, and ...
acid rock
—acid rocker. rock-'n'-roll music characterized by loud electronic distortions and strident lyrics that refer to drug-induced experiences. [1965-70] * * *
acid salt
Chem. a salt of a polybasic acid that is only partially neutralized by a base; a salt that is also an acid. [1720-30] * * *
acid soil
a soil of acid reaction or having a predominance of hydrogen ions, tasting sour in solution. * * *
acid test
a severe and conclusive test to establish quality, genuineness, worth, etc. [1890-95] * * *
acid test ratio
a ratio of cash, receivables, and marketable securities to current liabilities, used in determining credit risks. * * *
acid trip
—acid tripper. Slang. a psychedelic experience induced by ingesting the hallucinogen LSD. [1965-70] * * *
acid value
Chem. See acid number. * * *
acid-base theory
Any of several theories that give rise to alternative definitions of acids and bases. The original theory was based on Svante Arrhenius's electrolytic theory of solutions and ...
ac·id-base equilibrium (ăsʹĭd-bās') n. The state that exists when acidic and basic ions in solution exactly neutralize each other. * * *
acid-base indicator n. A substance that indicates the degree of acidity or basicity of a solution through characteristic color changes. * * *
—acid-fastness, n. /as"id fast', -fahst'/, adj. resistant to decolorizing by acidified alcohol after staining. [1900-05] * * *
See acid-fast. * * *
/as"id fawr'ming/, adj. 1. yielding acid in chemical reaction; acidic. 2. (of food) containing a large amount of acid ash after complete oxidation. [1865-70] * * *
/as"id hed'/, n. Slang. a person who habitually takes the drug LSD. Also, acidhead. [1965-70] * * *
/as"id luv'ing/, adj. (of a plant) requiring a pH of 4.5 to 5.5 for optimal growth. * * *
/as"id tungd'/, adj. bitingly critical or sarcastic; sharp-tongued: a critic famous for his acid-tongued reviews. * * *
/as"id wosht', -wawsht'/, adj. (of a denim garment) processed with a bleach solution so that the color becomes faded and grayish. * * *
/as'i dan"theuhr euh/, n. any bulbous African plant belonging to the genus Acidanthera, of the iris family, having sword-shaped leaves and long tubular flowers. [ < NL (1844) < ...
ac·i·de·mi·a (ăs'ĭ-dēʹmē-ə) n. Abnormal acidity of the blood. * * *
acidhead [as′idhed΄] n. 〚 ACID (n. 2) + HEAD (n. 22a)〛 Slang a habitual user of LSD * * * ac·id·head (ăsʹĭd-hĕd') n. Slang A person who uses LSD. * * *
/euh sid"ik/, adj. 1. acid (def. 6). 2. Geol. acid (def. 9). 3. acid-forming (def. 1). 4. containing acid-bearing pollutants: Acidic runoff is poisoning the nation's ...
See acidify. * * *
See acidifiable. * * *
See acidifiable. * * *
—acidifiable, adj. —acidification, n. —acidifier, n. /euh sid"euh fuy'/, v.t., v.i., acidified, acidifying. 1. to make or become acid; convert into an acid. 2. to make or ...
/as'i dim"i teuhr/, n. Chem. an instrument for measuring the amount of acid in a solution. [1830-40; ACID + -I- + -METER] * * *
See acidimeter. * * *
—acidimetric /euh sid'euh me"trik, as'i deuh-/, acidimetrical, adj. —acidimetrically, adv. /as'i dim"i tree/, n. Chem. the process of measuring the amount of acid in a ...
/euh sid"i tee/, n. 1. the quality or state of being acid. 2. sourness; tartness. 3. excessive acid quality, as of the gastric juice. [1610-20; < LL aciditas. See ACID, -ITY] * * ...
—acidization, n. /as"i duyz'/, v., acidized, acidizing. v.t. 1. to impregnate with acid; acidify. v.i. 2. to become acidified. Also, esp. Brit., acidise. [1905-10; ACID + ...
See acid. * * *
See acidly. * * *
/euh sid'euh jen"ik, as'i deuh-/, adj. Biochem. producing acid, as bacteria, or causing acidity, as of the urine. [ACID + -O- + -GENIC] * * *
/as'i dol"euh sis/, n. Chem. decomposition resulting from the interaction of a compound and an acid. [ < NL; see ACID, -O-, -LYSIS] * * *
/euh sid"euh fil, as"i deuh-/, adj. 1. Biol., Ecol. acidophilic. n. 2. Biol. an acidophilic cell, tissue, organism, or substance; eosinophil. Also, acidophile /euh sid'euh fuyl', ...
See acidophil. * * *
/euh sid'euh fil"ik, as'i deuh-/, adj. 1. Biol. having an affinity for acid stains; eosinophilic. 2. Ecol. thriving in or requiring an acid environment. Also, acidophilous /as'i ...
acidophilus milk
/as'i dof"euh leuhs/ a fermented milk produced by growing the bacterium Lactobacillus acidophilus in milk, used in medicine to alter the microbial flora of the intestinal tract ...
acidophilus milk n. Milk fermented by bacterial cultures that thrive in dilute acid, often used to alter the bacterial flora of the gastrointestinal tract in the treatment of ...
—acidotic /as'i dot"ik/, adj. /as'i doh"sis/, n. Pathol. a blood condition in which the bicarbonate concentration is below normal. [1895-1900; < NL; see ACID, -OSIS] * * ...
See acidosis. * * *
acid precipitation n. Precipitation abnormally high in sulfuric and nitric acid content that is caused by atmospheric pollutants. * * *
acid rain n. Acid precipitation falling as rain. * * *
acid reflux n. See heartburn. * * *
acid rock n. A style of rock music of the late 1960s having a prominent repetitive beat and lyrics that suggest psychedelic experiences. * * *
acid test n. A decisive or critical test, as of worth or quality.   [From the testing of gold in nitric acid.] * * *
/euh sij"euh leuhnt/, n. Chem. an acidulating substance. Also, acidulent. [1825-35; < F, n. use of prp. of aciduler, v. deriv. of L acidulus. See ACIDULOUS, -ANT] * * *
—acidulation, n. /euh sij"euh layt'/, v.t., acidulated, acidulating. 1. to make somewhat acid. 2. to sour; embitter. [1725-35; ACIDUL(OUS) + -ATE1] * * *
See acidulate. * * *
/euh sij"euh leuhnt/, n. 1. Chem. acidulant. adj. 2. acidulous. [1825-35] * * *
/euh sij"euh leuhs/, adj. 1. slightly sour. 2. sharp; caustic: his acidulous criticism of the book. 3. moderately acid or tart; subacid. Also, acidulent. [1760-70; < L acidulus. ...
ac·i·du·ri·a (ăs'ĭ-do͝orʹē-ə, -dyo͝orʹ-) n. A condition marked by the presence of acid in the urine. * * *
/as'i door"ik, -dyoor"-/, adj. (of bacteria) capable of growth in an acid environment. [appar. ACI(D) + L dur(are) to last + -IC] * * *
acid washing n. A washing process in which stones soaked in chlorine acid are used to soften and bleach fabric, especially denim garments.   acʹid-washed' (ăsʹĭd-wŏsht', ...
/as"i dee/, adj. of the nature of or resembling acid; sharp; sour: an acidy taste. [ACID + -Y1] * * *
acid–base catalysis
▪ chemistry       acceleration of a chemical reaction by the addition of an acid or a base, the acid or base itself not being consumed in the reaction. The catalytic ...
acid–base reaction
▪ chemistry Introduction       a type of chemical process typified by the exchange of one or more hydrogen ions, H+, between species that may be neutral (molecules, ...
—acieration, n. /as"ee euh rayt'/, v.t., acierated, acierating. to convert (iron) into steel. [1865-70; < F aciér(er) deriv. of acier steel ( < VL *aciarium, equiv. to L ...
/as"euh fawrm'/, adj. needle-shaped; acicular. [1840-50; < L aci- (comb. form of acus needle; cf. ACICULA) + -FORM] * * *
/as'euh nay"sheuhs/, adj. Bot. having many small seeds, as a grape. [1765-75; ACIN(US) + -ACEOUS] * * *
/as'euh nas"euh fawrm'/, adj. Bot. scimitar-shaped, as a leaf. [1765-75; < L acinac- (s. of acinaces < Gk akinákes short sword) + -I- + -FORM] * * *
ac·i·nar (ăsʹĭ-nər, -när') adj. Of or relating to an acinus. * * *
/as'euh nair"ee euhs/, adj. Bot. covered with globose vesicles resembling grape seeds, as certain algae. [prob. < F acinaire ( < L acin(us) ACINUS + F -aire -AIRE) + -IOUS] * * *
See acinus. * * *
/euh sin"euh fawrm'/, adj. 1. clustered like grapes. 2. acinous. [1840-50; ACIN(US) + -I- + -FORM] * * *
/as"euh neuhs/, adj. consisting of acini. Also, acinose /as"euh nohs'/. [1870-75; < L acinosus. See ACINUS, -OUS] * * *
—acinar /as"euh neuhr, -nahr'/, acinic /euh sin"ik/, adj. /as"euh neuhs/, n., pl. acini /-nuy'/. 1. Bot. one of the small drupelets or berries of an aggregate, baccate fruit, ...
▪ Italy       town and episcopal see, eastern Sicily, Italy, on terraces above the Ionian Sea at the foot of Mount Etna, 7 miles (11 km) northeast of Catania. Known as ...
/ay"sis/, n. Class. Myth. the lover of Galatea, killed by Polyphemus out of jealousy. * * * ▪ Greek mythology       in the Greek mythology of Ovid, the son of Faunus ...
/ak"ak'/, n. Informal. (esp. during World War II). 1. antiaircraft fire. 2. antiaircraft arms. Also, Ack-Ack. [1935-40; for A.A. (abbrev. of a(nti) a(ircraft)) as said by British ...
1. acknowledge. 2. acknowledgment. * * *
/euh kee"/, n. akee. * * *
Acker, Kathy
▪ American author born April 18, 1948, New York, New York, U.S. died Nov. 30, 1997, Tijuana, Mex.       American novelist whose writing style and subject matter reflect ...
Ackerley, J.R.
▪ British writer and editor in full  Joe Randolph Ackerley   born Nov. 4, 1896, Herne Hill, Kent, Eng. died June 4, 1967, Putney, near London       British novelist, ...
Ackerman, Diane
▪ American author née  Fink  born Oct. 7, 1948, Waukegan, Ill., U.S.       American writer whose works often reflect her interest in natural ...
Ackerman, Forrest J
▪ 2009       American writer and editor born Nov. 24, 1916, Los Angeles, Calif. died Dec. 4, 2008, Los Angeles championed the burgeoning genre of science fiction as ...
Ackermann, Konrad Ernst
(baptized Feb. 4, 1712, Schwerin, Mecklenburg died Nov. 13, 1771, Hamburg) German actor-manager. After training with a theatre company that specialized in German adaptations of ...
Ackermann, Louise-Victorine
▪ French poet née  Choquet  born November 30, 1813, Paris, Fr. died August 2, 1890, Nice       French poet who is best-known for works characterized by a deep sense ...
/ak"ee/, n., pl. ackeys. a silver coin minted in England in the late 18th and early 19th centuries for use in western Africa. [var. sp. of AKEE, the seeds of which served as a ...
—acknowledgeable, adj. —acknowledger, n. /ak nol"ij/, v.t., acknowledged, acknowledging. 1. to admit to be real or true; recognize the existence, truth, or fact of: to ...
See acknowledge. * * *
—acknowledgedly /ak nol"ijd lee, -i jid-/, adv. /ak nol"ijd/, adj. widely recognized; generally accepted: an acknowledged authority on Chinese art. [1760-70; ACKNOWLEDGE + ...
/ak nol"ij meuhnt/, n. 1. an act of acknowledging. 2. recognition of the existence or truth of something: the acknowledgment of a sovereign power. 3. an expression of ...
Ackroyd, Peter
▪ British author, biographer, critic and scholar born Oct. 5, 1949, London, Eng.       British novelist, critic, biographer, and scholar whose technically innovative ...
/ak"teuhn/, n. Armor. acton. * * *
/ak"lee/, n. the hard, durable wood of a Philippine leguminous tree, Albizzia acle, used for making fine furniture. [ < Tagalog aklé] * * *
/euh kluy'steuh kahr"dee euh, ay kluy'-/, n. Pathol. a failure of the foramen ovale of the heart to close. [ < Gk ákleisto(s) not closed (a- A-6 + kleis-, var. s. of kléiein to ...
aclinic line
/ay klin"ik/ an imaginary line on the surface of the earth, close and approximately parallel to the equator, connecting all those points over which a magnetic needle shows no ...
a·clin·ic line (ā-klĭnʹĭk) n. See magnetic equator.   [From Greek aklinēs, not inclining to either side : a-, not; see a-1 + klīnein, to lean; See klei-. * * *
1. See American Civil Liberties Union. 2. American College of Life Underwriters. Also, A.C.L.U. * * *
ACM abbr. asbestos-containing material. * * *
—acmic /ak"mik/, acmatic /ak mat"ik/, adj. /ak"mee/, n. the highest point; summit; peak: The empire was at the acme of its power. [1610-20; < Gk akmé point, highest point, ...
/ak"mee iz'euhm/, n. a school of early 20th-century Russian poetry whose practitioners were strongly opposed to the vagueness of symbolism and strove for absolute clarity of ...
▪ Russian poets Russian  Akmeist,  plural  Akmeisty,         member of a small group of early-20th-century Russian poets reacting against the vagueness and ...
/ak'meuhs thee"zheuh, -zhee euh, -zee euh/, n. Psychol. awareness of sharp points through the sense of touch without experiencing pain. Also, acmaesthesia. [ < Gk akm(é) ACME + ...
/ak"muyt/, n. a rare pyroxene mineral, sodium-ferric iron silicate, NaFe(Si2O6), found in feldspathoid rocks. [1830-40; < Gk akm(é) sharp point + -ITE1] * * *
—acned, adj. /ak"nee/, n. Pathol. an inflammatory disease of the sebaceous glands, characterized by comedones and pimples, esp. on the face, back, and chest, and, in severe ...
acne rosacea
Pathol. rosacea. [1895-1900] * * *
See acne. * * *
/ak'ni jen"ik/, adj. Pathol. causing or able to cause acne. [1975-80; ACNE + -GENIC] * * *
/ak nee"mee euh/, n. Pathol. 1. a condition characterized by atrophy of the muscles of the calf of the leg. 2. congenital absence of the legs. [A-6 + cnem- ( < Gk knéme shin) + ...
acne rosacea n. See rosacea. * * *
acnode [ak′nōd΄] n. 〚< L acus (see ACEROSE1) + NODE〛 Math. an isolated point on the graph of an equation * * *
/ak"oh az'euhm/, n. acouasm. * * *
/euh kok"/, adv., adj. cocked. [1840-50; A-1 + COCK2] * * *
/ay see"leuh mayt', ay'see loh"mit/, Zool. adj. 1. Also, acoelomatous /ay'see lom"euh teuhs, -loh"meuh-/, acoelomous. having no coelum. n. 2. any organism that lacks a cavity ...
/ay see"leuhs/, adj. 1. without a true alimentary canal. 2. acoelomate. [A-6 + COEL(UM) + -OUS] * * *
▪ Byzantine monks also called  Acoemetae (Medieval Latin) , Late Greek  Akoimetoi        monks at a series of 5th- to 6th-century Byzantine monasteries who were ...
/ay'see neuhs thee"zheuh/, n. Psychiatry. acenesthesia. [A-6 + COENESTHESIA] * * *
/euh kohld"/, adj. Archaic. being cold or chilled. [bef. 900; ME acolde, OE acolod, ptp. of acolian to grow cold. See A-3, COOL, -ED2] * * *
/ak"euh luyt'/, n. 1. an altar attendant in public worship; altar boy. 2. Rom. Cath. Ch. a. a member of the highest-ranking of the four minor orders. b. the order itself. Cf. ...
/ak"euh maw'-, -meuh, ah"keuh/, n. a Pueblo Indian village near Albuquerque, New Mexico, built on a sandstone mesa: oldest continuously inhabited location in the U.S. * * ...
/ah'kawng kah"gwah/, n. a mountain in W Argentina, in the Andes: the highest peak in the Western Hemisphere. 22,834 ft. (6960 m). * * *
Aconcagua River
▪ river, Chile Spanish  Río Aconcagua        river in central Chile. It rises in the northwestern foothills of Mount Aconcagua of the Andes Mountains and flows ...
Aconcagua, Mount
Mountain, western Argentina, on the Chilean border. Located in the Andes Mountains at an elevation of 22,834 ft (6,960 m), it is widely considered the highest peak in the ...
—aconitic /ak'euh nit"ik/, adj. /ak"euh nuyt'/, n. any plant belonging to the genus Aconitum, of the buttercup family, having irregular flowers usually in loose clusters, ...
▪ Greek legendary figure       in Greek legend, a beautiful youth of the island of Ceos. During the festival of Artemis at Delos, Acontius saw and loved Cydippe, a girl ...
Acontius, Jacobus
▪ Italian religious reformer Aconcio also spelled  Aconzio , Italian  Giacomo Aconcio  born September 7, 1492, Trent [now Trento, Italy] died 1566?, ...
▪ plant order       the sweet flag order of flowering plants and the most basal lineage among the monocotyledons (monocotyledon) (monocots), which are characterized by ...
A·ço·res (ä-sôrʹĕsh) See Azores. * * *
—acorned, adj. /ay"kawrn, ay"keuhrn/, n. 1. the typically ovoid fruit or nut of an oak, enclosed at the base by a cupule. 2. a finial or knop, as on a piece of furniture, in ...
acorn and nut weevil
▪ insect subfamily       any of approximately 45 species of weevils in the family Curculionidae (order Coleoptera) that have extremely long and slender snouts, which in ...
acorn barnacle
acorn barnacle any of a genus (Balanus) of stalkless barnacles that resemble acorns * * *
acorn barnacle.
See under barnacle1 (def. 1). * * *
acorn chair
Eng. Furniture. a Jacobean chair having a crossrail with acorn-shaped pendants. * * *
acorn clock
a mantel clock of the first half of the 19th century, having the upper part of the case shaped with a double ogee curve to resemble an acorn. * * *
acorn spoon
a spoon having an acornlike ornament at the end of its stem. * * *
acorn squash
an acorn-shaped variety of winter squash, growing to 18 in. (46 cm) long and 14 in. (36 cm) in diameter, having a dark-green to orange-yellow skin and yellow to orange ...
acorn sugar
Chem. quercitol. [1895-1900] * * *
acorn tube
Electronics. a vacuum tube, resembling an acorn in size and shape, used chiefly in ultrahigh-frequency electronic devices. [1930-35] * * *
acorn worm
any of several burrowing, often brilliantly colored hemichordates of the class Enteropneusta, usually found in intertidal sand and mud, having an acorn-shaped proboscis and ...
acorn squash white acorn squash © School Division, Houghton Mifflin Company n. A type of winter squash shaped somewhat like an acorn and having longitudinal ridges, a variously ...
acorn worm n. Any of a class (Enteropneusta) of hemichordate, wormlike animals that inhabit shallow burrows in mud or sand flats of intertidal zones and are equipped with an ...
▪ philosophy       in philosophy, the view that God is the sole and ultimate reality and that finite objects and events have no independent existence. Acosmism has been ...
Acosta, Joaquín
▪ Colombian scientist born Dec. 29, 1799/1800, Guaduas, New Granada [now in Colombia] died Feb. 21, 1852, Guaduas, Colom.       Colombian scientist, historian, and ...
Acosta, José de
▪ Spanish theologian born 1539, Medina del Campo, Spain died Feb. 15, 1600, Salamanca       Jesuit theologian and missionary to the New World, chiefly known for his ...
Acosta, Uriel
orig. Gabriel da Costa born с 1585, Oporto, Port. died April 1640, Amsterdam, Neth. Portuguese Jewish freethinker. Born into a Marrano family, he came to feel that there was ...
—acotyledonous /ay"kot'l eed"n euhs, ay kot'-/, adj. /ay"kot'l eed"n, ay kot'-/, n. a plant without cotyledons, therefore one belonging to a group lower than the seed ...
/euh kooh"az euhm, ak"ooh az'-/, n. Psychiatry. a nonverbal auditory hallucination, as a ringing or hissing. Also, acoasm, acousma. [ < Gk ákou(sma) something heard (akous-, s. ...
▪ rodent incorrectly spelled  acouchi  or  acuchi        either of two species of South American rodents (rodent) that resemble the small tropical-forest (tropical ...
/euh koohz"meuh/, n., pl. acousmas, acousmata. acouasm. * * *
—acoustically, adv. /euh kooh"stik/, adj. Also, acoustical. 1. pertaining to the sense or organs of hearing, to sound, or to the science of sound. 2. (of a building material) ...
acoustic coupler
Computers. a modem designed to connect a telephone handset to a computer terminal or processor. [1965-70] * * *
acoustic feature
Phonet. 1. any acoustic property of a speech sound that may be recorded and analyzed, as its fundamental frequency or formant structure. 2. an acoustic property that defines a ...
acoustic feedback
Electronics. (in an audio system, esp. a public-address system) the feedback of sound from a loudspeaker to a microphone, often resulting in a whistling noise caused by ...
acoustic guitar
a traditional, unamplified guitar. Also called Spanish guitar. Cf. electric guitar. * * *
acoustic impedance
Acoustics. the total reaction of a medium to the transmission of sound through it, expressed as the ratio of sound pressure to particle velocity at a given point in the medium. * ...
acoustic inertance
Acoustics. inertance. Also called acoustic mass. * * *
acoustic interferometer
▪ instrument       device for measuring the velocity and absorption of sound waves in a gas or liquid. A vibrating crystal creates the waves that are radiated ...
acoustic mine
a naval mine designed to be exploded by the vibration of the propeller of a passing ship or by the sound of water along the hull. Also called sonic mine. Cf. contact mine, ...
acoustic nerve.
See auditory nerve. * * *
acoustic neuroma
▪ pathology       benign tumour on the vestibulocochlear nerve (also called acoustic nerve) near its point of entry into the inner ear. The tumour, though benign, may ...
acoustic ohm
Acoustics. the unit of acoustic impedance, equal to the impedance of a medium in which a sound pressure of one dyne per square centimeter produces a velocity of one centimeter ...
acoustic phonetics
1. the branch of science dealing with the sounds of speech in terms of their frequency, duration, intensity, etc., esp. as analyzed by means of instruments like the sound ...
acoustic reactance
Acoustics. acoustic impedance caused by the inertia and elasticity of the transmitting medium. Also called reactance. * * *
acoustic resistance
Acoustics. acoustic impedance caused by the internal friction of the transmitting medium. * * *
acoustic theodolite
Oceanog. an acoustic device that records a continuous vertical profile of ocean currents at a particular site. [1975-80] * * *
acoustic torpedo
a torpedo guided by sound that either emanates from the target or is emitted by the torpedo and bounces off the target. * * *
acoustic trauma
▪ physiology       physiological changes in the body caused by sound waves. Sound waves cause variations in pressure, the intensity of which depends upon the range of ...
acoustical [ə ko͞os′ti kəl] adj. acoustic; specif., having to do with the control of sound [acoustical tile absorbs sounds] * * *
acoustical cloud
one of a number of acoustic panels installed near the ceiling of a concert hall to reflect sound for improving the acoustic quality of music. * * *
acoustical surveillance
the collecting or recording of information by sound-detection methods and devices, as for intelligence purposes. * * *
acoustical tile
tile made in various sizes and textures from soft, usually fibrous, sound-absorbing material, as wood, cork, or metal, and typically applied to ceilings or walls. * * *
acoustically [ə ko͞os′tik lē] adv. with reference to acoustics; from the standpoint of acoustics * * * See acoustic. * * *
/ak'oo stish"euhn/, n. an acoustic engineer. [1875-80; ACOUST(ICS) + -ICIAN] * * *
acoustic nerve n. Either of the eighth pair of cranial nerves that divides to form the cochlear nerve and the vestibular nerve. Also called auditory nerve. * * *
/euh kooh"stiks/, n. 1. (used with a sing. v.) Physics. the branch of physics that deals with sound and sound waves. 2. (used with a pl. v.) the qualities or characteristics of a ...
acoustics, architectural
Relationship between sound produced in a space and its listeners, of particular concern in the design of concert halls and auditoriums. Good acoustic design takes into account ...
acoustic spectrography n. A technique for studying sound by separating it into its component frequencies. Also called audiospectrography. * * *
/ak'oo stim"i teuhr/, n. a portable electronic device for measuring noise levels, esp. those of traffic. [ACOUST(IC) + -I- + -METER] * * *
/euh kooh'stoh i lek"trik/, adj. electroacoustic. [1965-70; ACOUSTIC + -O- + ELECTRIC] * * *
See acoustoelectric. * * *
See acoustooptics. * * *
See acoustooptical. * * *
—acoustooptic, acoustooptical, adj. —acoustooptically, adv. /euh kooh'stoh op"tiks/, n. (used with a sing. v.) the science and technology of the interactions between sound ...
ACP abbrev. American College of Physicians * * * ACP abbr. American College of Physicians. * * *
acceptance. * * *
/euh kwaynt"/, v.t. 1. to make more or less familiar, aware, or conversant (usually fol. by with): to acquaint the mayor with our plan. 2. to furnish with knowledge; inform ...
/euh kwayn"tns/, n. 1. a person known to one, but usually not a close friend. 2. the state of being acquainted. 3. personal knowledge as a result of study, experience, etc.: a ...
acquaintance rape
forced sexual intercourse with a person known to the victim. [1980-85] * * *
acquaintance rape n. Rape perpetrated by someone known to the victim. * * *
See acquaintance. * * *
—acquaintedness, n. /euh kwayn"tid/, adj. 1. having personal knowledge as a result of study, experience, etc.; informed (usually fol. by with): to be acquainted with law. 2. ...
/euh kwest"/, n. Law. property acquired other than by inheritance, as by purchase or gift. [1605-15; < obs. F < VL *acquaesitum that which has been acquired, n. use of ...
—acquiescingly, adv. /ak'wee es"/, v.i., acquiesced, acquiescing. to assent tacitly; submit or comply silently or without protest; agree; consent: to acquiesce halfheartedly in ...
/ak'wee es"euhns/, n. 1. the act or condition of acquiescing or giving tacit assent; agreement or consent by silence or without objection; compliance (usually fol. by to or in): ...
—acquiescently, adv. /ak'wee es"euhnt/, adj. disposed to acquiesce or consent tacitly. [1745-55; < L acquiescent- (s. of acquiescens, prp. of acquiescere). See ACQUIESCE, ...
See acquiescent. * * *
See acquire. * * *
—acquirable, adj. —acquirability, n. —acquirer, n. /euh kwuyeur"/, v.t., acquired, acquiring. 1. to come into possession or ownership of; get as one's own: to acquire ...
ac·quired (ə-kwīrdʹ) adj. 1. Of or relating to a disease, condition, or characteristic that is not congenital but develops after birth. 2. Resulting from exposure to ...
acquired character
Genetics. a noninheritable character that results from certain environmental influences. [1875-80] * * * ▪ biology       in biology, modification in structure or ...
acquired immune deficiency syndrome
acquired immune deficiency syndrome AIDS: also acquired immunodeficiency syndrome * * *
acquired immune deficiency syndrome.
See AIDS. Also, acquired immunodeficiency syndrome. * * *
acquired immunity
Immunol. immunity arising from exposure to antigens. Cf. natural immunity. [1930-35] * * *
acquired antibody n. An antibody produced by an immune response, in contrast to one occurring naturally in an individual. * * *
acquired character n. A nonhereditary change of function or structure in a plant or animal made in response to the environment. Also called acquired characteristic. * * *
acquiredimmune deficiency syndrome
acquired immune deficiency syndrome n. AIDS. * * *
acquired immunity n. Immunity obtained either from the development of antibodies in response to exposure to an antigen, as from vaccination or an attack of an infectious disease, ...
acquired taste n. One that is unpleasant on immediate experience or is likeable only after being experienced repeatedly. * * *
/euh kwuyeur ee"/, n. something that is acquired: a press conference to promote the conglomerate's latest acquirees. [ACQUIRE + -EE] * * *
/euh kwuyeur"meuhnt/, n. 1. the act of acquiring, esp. the gaining of knowledge or mental attributes. 2. Often, acquirements. something that is acquired, esp. an acquired ability ...
See acquirable. * * *
—acquisitional, adj. —acquisitor /euh kwiz"i teuhr/, n. /ak'weuh zish"euhn/, n. 1. the act of acquiring or gaining possession: the acquisition of real estate. 2. something ...
—acquisitively, adv. —acquisitiveness, n. /euh kwiz"i tiv/, adj. tending or seeking to acquire and own, often greedily; eager to get wealth, possessions, etc.: our ...
See acquisitive. * * *
See acquisitively. * * *

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