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iodine-131
A radioactive iodine isotope; beta and gamma emitter with a half-life of 8.1 days; used as a tracer in thyroid studies, as therapy in hyperthyroidism and thyroid cancer, and as ...
iodine-132
A beta- and gamma-emitting radioisotope of iodine with a half-life of 2.28 h, usually obtained from a tellurium-132 radionuclide generator; its clinical use has been supplanted ...
iodine-fast
Denoting hyperthyroidism unresponsive to iodine therapy, which develops frequently in most cases so treated.
iodinophil, iodinophile
1. Staining readily with iodine. SYN: iodinophilous. 2. Any histologic element that stains readily with iodine. [iodine + G. philos, fond]
iodinophilous
SYN: iodinophil (1).
iodipamide
An ionic, dimeric, water-soluble radiographic contrast medium for intravenous cholangiography; used as the sodium or methylglucamine salt. SYN: Adipiodone. - methylglucamine ...
iodism
Poisoning by iodine, a condition marked by severe coryza, an acneform eruption, weakness, salivation, and foul breath; caused by the continuous administration of iodine or one ...
iodixanol
5,5′-[(2-Hydroxy-1,3-propane)bis(acetylamino)]bis[N,N′-bis(2,3- dihydroxypropyl)-2,4,6- triiodo-1,3-benzenedicarboxamide]; a dimeric, nonionic, low osmolar, water-soluble ...
iodize
To treat or impregnate with iodine.
iodized oil
An iodine addition product of vegetable oils, containing not less than 38% and not more than 42% of organically combined iodine; a radiopaque medium.
iodoacetamide
ICH2—CONH2; a chemical reacting readily with sulfhydryl groups and therefore a strong inhibitor of many enzymes.
iodoalphionic acid
A radiographic contrast medium formerly used for cholecystography.
iodocasein
A compound of iodine with casein, in which the iodine is attached to tyrosine molecules; possesses thyroxine activity.
iodochlorhydroxyquin, iodochlorohydroxyquinoline
Topical antiinfective. SYN: chloriodoquin, clioquinol.
iodochlorol
SYN: chloriodized oil.
iododerma
1An eruption of follicular papules and pustules, or panniculitis, caused by iodine toxicity or sensitivity.
iodoform
A topical antiseptic. SYN: triiodomethane.
iodoglobulin
SYN: thyroglobulin (1).
iodogorgoic acid
3,5-Diiodotyrosine; a precursor of thyroxine.
iodohippurate sodium
A radiopaque compound formerly used intravenously, orally, or for retrograde urography. When tagged with iodine-131, it is used to measure effective renal plasma flow and to ...
iodomethamate sodium
A high osmolar, ionic, water-soluble, radiographic contrast medium formerly used widely as the disodium salt for intravenous urography.
iodometric
Relating to iodometry.
iodometry
Analytic techniques involving titrations in which visible form(s) of iodine is either formed or consumed, the sudden appearance or disappearance of iodine marking the end point. ...
iodopanoic acid
SYN: iopanoic acid.
iodophendylate
SYN: iophendylate.
iodophilia
An affinity for iodine, as manifested by some leukocytes in certain conditions. When treated with a solution of iodine and potassium iodide, normal polymorphonuclear leukocytes ...
iodophor
A combination of iodine with a surfactant carrier, usually polyvinylpyrrolidone. Commercial preparations generally contain 1% “available” iodine, which is slowly released to ...
iodophthalein
A radiographic contrast medium. The disodium salt was once used in radiography of the gallbladder. SYN: tetraiodophenolphthalein sodium.
iodopropylidene glycerol
SYN: iodinated glycerol.
iodoproteins
Proteins containing iodine bound to tyrosyl groups.
iodopsin
Any of three visual pigments, composed of 11-cis-retinal bound to an opsin, found in the cones of the retina. SYN: visual violet. [G. ion, violet, + ops, eye, + -in]
iodopyracet
A radiographic contrast medium formerly used for intravenous urography; also used to determine the renal plasma flow and the renal tubular excretory mass. SYN: diodone.
iodoquinol
Drug used as an amebicide prepared by the action of iodine monochloride on 8-hydroxyquinoline.
iodotherapy
Treatment with iodine.
iodothyronines
Iodinated derivatives of thyronine.
iodotyrosine
An iodinated tyrosine. - i. deiodase SYN: iodide peroxidase.
iodoxamate meglumine
The methylglucamine salt of an ionic, water-soluble, dimeric, radiographic contrast medium; formerly used primarily for intravenous cholangiography.
ioduria
Urinary excretion of iodine.
ioglycamic acid
3,3′-[oxybis(methylene carbonylimino)]bis[2,4,6-triiodobenzoic acid]; an ionic, water-soluble, dimeric, radiographic contrast medium, formerly used for intravenous ...
iohexol
A monomeric, nonionic, water-soluble, low osmolar radiographic contrast medium for urography or angiography. Used intrathecally and intravascularly.
iometer
An apparatus for measuring ionization. [ion + G. metron, measure]
ion
An atom or group of atoms carrying an electric charge by virtue of having gained or lost one or more electrons. Ions charged with negative electricity (anions) travel toward a ...
ion exchange
See anion exchange, cation exchange, i. chromatography.
ion exchanger
See anion exchanger, cation exchanger.
Ionescu
See Jonnesco.
ionic
Relating to an ion.
ionium
Former term for thorium-230. [G. ion, going]
ionization
1. Dissociation into ions, occurring when an electrolyte is dissolved in water or certain liquids or when molecules are subjected to electrical discharge or ionizing radiation. ...
ionize
To separate into ions; to dissociate atoms or molecules into electrically charged atoms or radicals.
ionogram
SYN: electropherogram.
ionone
One of two cyclic terpene ketones with an odor of violets or cedar wood, the α and β varieties of which differ in the location of the double bond in the ring : provitamins A ...
ionopherogram
SYN: electropherogram.
ionophore
A compound or substance that forms a complex with an ion and transports it across a membrane. [ion + G. phore, a bearer]
ionophoresis
SYN: electrophoresis. [ion + G. phoresis, a carrying]
ionophoretic
SYN: electrophoretic.
Iontophoresis
A transdermal delivery system in which a substance bearing a charge is propelled through the skin by a low electrical current. This method can be used to drive a drug across the ...
iontophoretic
Relating to iontophoresis.
iontotherapy
SYN: iontophoresis.
IOP (intraocular pressure)
The pressure created by the continual renewal of fluids within the eye. The normal IOP varies among individuals. The intraocular pressure is increased in glaucoma. In acute ...
iopamidol
A monomeric, nonionic, water-soluble, low osmolar radiographic contrast medium for urography or angiography.
iopanoic acid
A water-insoluble radiographic contrast medium, once used widely for oral cholecystography. SYN: iodopanoic acid.
iopentol
N,N′-Bis(2,3-dihydroxypropyl)-5-[N-(2-hydroxy-3-methoxypropyl) acetamido]-2,4,6-triiodoisophthalamide; a nonionic, monomeric, low osmolar radiographic contrast medium for ...
iophendylate
A mixture of isomers of ethyl iodophenylundecylate, an iodized fatty acid of low viscosity; used for radiography of the spinal canal. SYN: iodophendylate.
iophenoic acid
SYN: iophenoxic acid.
iophenoxic acid
A radiographic contrast medium; formerly used for oral cholecystography. SYN: iophenoic acid.
iophobia
Morbid fear of poisons. [G. ios, poison, + phobos, fear]
iopromide
N,N′-Bis(2,3-dihydroxy propyl)-2,4-6-triiodo-5-(2-methoxyacetamido)-N-methyl isophthalamide; a monomeric, nonionic, water-soluble, low osmolar radiographic contrast medium ...
iota
1. The ninth letter in the Greek alphabet. 2. In chemistry, denotes the ninth in a series, or the ninth atom from a carboxyl group or other functional group. 3. A tiny or minute ...
iotacism
A speech defect marked by the frequent substitution of a long e sound (that of the Greek iota) for other vowels. [G. iota, the letter ι]
iothalamic acid
An ionic, monomeric, water-soluble radiographic contrast medium, widely used as the sodium or methylglucamine salt (iothalamate) for intravenous urography and angiography.
iothiouracil sodium
The sodium salt of 5-iodo-2-thiouracil; an organic iodine derivative of thiouracil with the thyroid-involuting action of iodine and the capability of inhibiting thyroxine ...
iotrol
SYN: iotrolan.
iotrolan
5,5′-[Malonylbis(methylimino)]bis[N, N′-bis[2,3-dihydroxy-1-(hydroxymethyl)propyl]-2,4,6-triiodoisophthalamide]; a dimeric, nonionic, water-soluble, low osmolar ...
ioversol
N,N′-Bis(2,3-dihydroxypropyl)-5-[N-[2-hydroxyethyl)glycolamido]-2,4,6-triiodoisophthalamide; a water-soluble, nonionic, low osmolar, radiographic contrast medium.
ioxaglate
A diagnostic radiopaque medium, usually a combination of i. meglumine (C24H21I6N5O8 C7H17NO5), and i. sodium (C24H20I6N5NaO8); used in angiography, aortography, ...
ioxilan
N-(2,3-Dihydroxypropyl)-5-[N(2,3-dihydroxypropyl)acetamido]-N′-(2-hydroxyethyl)-2,4,6-triiodoisophthalamide; a monomeric, nonionic, water-soluble, low osmolar radiographic ...
ioxithalamate
5-Acetamido-2,4,6-triiodo-N-(2-hydroxyethyl)isophthalamic acid; an ionic, monomeric, water-soluble radiographic contrast medium for urography and angiography.
IP3
Abbreviation for inositol 1,4,5-trisphosphate.
IPA
Abbreviation for independent practice association; isopropyl alcohol.
Ipecac
A naturally occurring substance with multiple properties including the ability to cause vomiting (emesis). Ipecac is derived from dried roots of a bush called Uragoga ...
ipecacuanha
The dried root of Uragoga (Cephaelis) i. (family Rubiaceae), a shrub of Brazil and other parts of South America; contains emetine, cephaeline, emetamine, ipecacuanhic acid, ...
IPF
Abbreviation for idiopathic pulmonary fibrosis or interstitial pulmonary fibrosis.
ipodate
A radiographic contrast medium, given orally as the sodium or, more often, the calcium salt, for opacification of the gallbladder and central biliary tree.
ipomea
The dried root of Ipomoea orizabensis (family Convolvulaceae). SEE ALSO: i. resin. SYN: orizaba jalap root. [G. ips (ip-), a worm, + homoios, like]
Ipomoea
A plant genus of the family Convolvulaceae including the morning glory. [L. ipomea] - I. rubrocoerulea praecox the seeds contain lysergic acid amide, isolysergic acid amide, ...
IPPB
Abbreviation for intermittent positive pressure breathing.
IPPV
Abbreviation for intermittent positive pressure ventilation.
ipratropium
A synthetic quaternary ammonium compound, chemically related to atropine, that has anticholinergic activity and is a bronchodilator given by inhalation.
iproniazid
An antituberculous and antidepressant agent similar to isoniazid, but more toxic and rarely used; it inhibits monoamine oxidase. The first antidepressant agent.
iproveratril
SYN: verapamil.
iPrSGal
Abbreviation for isopropylthiogalactoside.
Ips
Abbreviation for pipsyl.
ipsefact
All parts or aspects of the environment that an individual, colony, population, or species of animal has modified chemically or physically by its own behavior ( e.g., a nest or ...
Ipsilateral
On the same side. The opposite of contralateral (the other or opposite side). For example, a tumor involving the right side of the brain may affect vision ipsilaterally (that is, ...
IPSP
Abbreviation for inhibitory postsynaptic potential.
IPTG
Abbreviation for isopropylthiogalactoside.
IPV
Abbreviation for inactivated poliovirus vaccine. See poliovirus vaccines, under vaccine.
IQ
Abbreviation for intelligence quotient, an attempt to measure the intelligence of someone. The IQ score is usually based upon the results of a written test. To calculate the ...
Ir
Symbol for iridium.
IR, ir
Abbreviation for infrared.
IRB
Abbreviation for institutional review board.
irid-
See irido-.
iridal
Relating to the iris. SYN: iridial, iridian, iridic.
iridectomy
1. Excision of a portion of the iris. 2. The hole in the iris produced by a surgical i.. [irido- + G. ektome, excision] - buttonhole i. SYN: peripheral i.. - optical i. i. ...
iridencleisis
The incarceration of a portion of the iris by corneoscleral incision in glaucoma to effect filtration between the anterior chamber and subconjunctival space. [irido- + G. ...
irideremia
Condition wherein the iris is so rudimentary as to appear to be absent. Cf.:aniridia. [irido- + G. eremia, absence]
irides
Plural of iris. [G.]
iridescent
Presenting multiple bright refractile colors, typically as a result of optical interference when incident white light is broken into its spectral components when reflected back ...
iridesis
Ligature of a portion of the iris brought out through an incision in the cornea. [irido- + G. desis, a binding together]
iridin
1. Irigenin 7-glucoside from orris root, Iris florentina. 2. A resinoid from blue flag, Iris versicolor; used as a cholagogue and cathartic. SYN: irisin.
iridium
A white, silvery metallic element, atomic no. 77, atomic wt. 192.22; 192Ir is a radioisotope (half-life of 73.83 days) that has been used in the interstitial treatment of ...
irido-, irid-
The iris. [G. iris (irid-), rainbow]
iridoavulsion
Avulsion, or tearing away, of the iris.
iridocele
Herniation of a portion of the iris through a corneal defect. [irido- + G. kele, hernia]
iridochoroiditis
Inflammation of both iris and choroid.
iridocoloboma
A coloboma or congenital defect of the iris. [irido- + G. koloboma, coloboma]
iridocorneal
Relating to the iris and the cornea.
iridocyclectomy
Removal of the iris and ciliary body for excision of a tumor. [irido- + G. kyklos, circle (ciliary body), + ektome, excision]
iridocyclitis
Inflammation of both iris and ciliary body. SEE ALSO: iritis, uveitis. [irido- + G. kyklos, circle (ciliary body), + -itis, inflammation] - i. septica SYN: Behçet syndrome.
iridocyclochoroiditis
Inflammation of the iris, involving the ciliary body and the choroid.
iridocystectomy
An operation for making an artificial pupil when posterior synechiae follow extracapsular extraction of cataract; the border of the iris and a portion of the capsule of the lens ...
iridodiagnosis
Diagnosis of systemic diseases by observation of changes in form and color of the iris.
iridodialysis
A colobomatous defect of the iris caused by its separation from the scleral spur. [irido- + G. dialysis, loosening]
iridodilator
Causing dilation of the pupil; applied to the musculus dilator pupillae.
iridodonesis
Agitated motion of the iris. SYN: tremulous iris. [irido- + G. doneo, to shake to and fro]
iridokinetic
Relating to the movements of the iris.
Iridology
The practice of diagnosing disease by examining the iris of the eye. Although some diseases do affect the eye, iridology is not considered scientific medicine. * * * A ...
iridomalacia
Degenerative softening of the iris. [irido- + G. malakia, softness]
iridomesodialysis
Separation of adhesions around the inner margin of the iris. [irido- + G. mesos, middle, + dialysis, loosening]
iridomotor
SYN: pupillomotor.
iridoparalysis
SYN: iridoplegia.
iridopathy
Pathologic lesions in the iris.
iridoplegia
Paralysis of the musculus sphincter iridis. SYN: iridoparalysis. [irido- + G. plege, stroke] - complete i. paralysis of both the dilator and sphincter muscles of the iris. - ...
iridoptosis
Prolapse of the iris. [irido- + G. ptosis, a falling]
iridorrhexis
Deliberate, surgical tearing of the iris from the scleral spur in order to increase the breadth of a coloboma. [irido- + G. rhexis, rupture]
iridoschisis
Separation of the anterior layer of the iris from the posterior layer; ruptured anterior fibers float in the aqueous humor. [irido- + G. schisma, cleft]
iridosclerotomy
An incision involving both sclera and iris. [irido- + sclera, + G. tome, incision]
iridotomy
Transverse division of some of the fibers of the iris, forming an artificial pupil. [irido- + G. tome, incision] - laser i. peripheral iridectomy as performed by laser.
Iridoviridae
A family of viruses including iridescent viruses of insects (Iridovirus) and viruses that infect frogs and fish. These viruses are large, icosahedral (120–170 nm in diameter), ...
Iridovirus
A genus of viruses (family Iridoviridae) comprised of the iridescent insect viruses of which the type species is the tipula iridescent virus.
irigenin
A trihydroxy trimethoxy isoflavone component of iridin.
Iris
The iris is the circular, colored curtain of the eye. Its opening forms the pupil. The iris helps regulate the amount of light that enters the eye. The eye has a number of other ...
iris frill
SYN: collarette.
Iris, speckled
Due to little white (or lightly colored) spots that are slightly elevated on the surface of the iris. These spots, arranged in a ring concentric with the pupil, occur in normal ...
irisin
SYN: iridin (2).
iritic
Relating to iritis.
Iritis
Inflammation of the iris. The iris is the circular, colored curtain in the front of the visible of the eye. (The opening of the iris forms the pupil.) * * * Inflammation of the ...
Iron
An essential mineral. Iron is necessary for the transport of oxygen (via hemoglobin in red blood cells) and for oxidation by cells (via cytochrome). Deficiency of iron is a ...
Iron deficiency anemia
The most common known form of nutritional disorder in the world, iron deficiency results in anemia because iron is necessary to make hemoglobin, key molecule in red blood cells ...
Iron excess
Iron overload can damage the heart, liver, gonads and other organs. Iron overload is a particular risk for: {{}}People with certain genetic conditions such as hemochromatosis; ...
Iron poisoning
Iron supplements meant for adults (such as pregnant women) are a major cause of poisoning in children. Care should be taken to keep iron supplements safely away from children.
Iron supplementation, infant
Iron is included in most infant formulas. Therefore, there is no evidence that iron supplementation is necessary for healthy formula-fed, full-term infants. In the past it was ...
iron-52
A radioactive iron isotope; a cyclotron-produced positron emitter with a half-life of 8.28 h, used to study iron metabolism.
iron-55
An iron isotope; a positron emitter with a half-life of 2.73 years; used (less often than 59Fe) as a tracer in study of iron metabolism and in blood perfusion studies.
iron-59
An iron isotope; a gamma and beta emitter with a half-life of 44.51 days; used as tracer in the study of iron metabolism, determination of blood volume, and in blood transfusion ...
irradiate
To apply radiation from a source to a structure or organism. [see irradiation]
irradiation
1. The subjective enlargement of a bright object seen against a dark background. 2. Exposure to the action of electromagnetic radiation ( e.g., heat, light, x-rays). 3. The ...
irrational
Not rational; unreasonable (contrary to reason) or unreasoning (not exercising reason). [L. irrationalis, without reason]
irreducible
1. Not reducible; incapable of being made smaller. 2. In chemistry, incapable of being made simpler, or of being replaced, hydrogenated, or reduced in positive charge.
irrespirable
1. Incapable of being inhaled because of irritation to the airway, resulting in breath-holding. 2. Denoting a gas or vapor either poisonous or containing insufficient oxygen. 3. ...
irresponsibility
The state of not acting in a manner that is responsible, for conscious or unconscious reasons. - criminal i. the state, usually attributed to mental defect or disease, that ...
irresuscitable
Incapable of being revived.
irreversible
Incapable of being reversed; permanent. [L. in- (ir-) neg. + re-verto, pp. -versus, to turn back]
Irrigate
To wash out as, for example, a wound to clean it. * * * To perform irrigation. [L. ir-rigo, pp. -atus, to i., fr. in, on, + rigo, to water]
irrigation
The washing out of a body cavity, space, or wound with a fluid. [see irrigate]
Irrigation of the colon
The use of liquid solutions given by enema to remove material from the rectum or colon, ostensibly to eliminate toxins from the bowel. Unless ordered by a physician, this ...
irrigator
An appliance used in irrigation.
irritability
The property inherent in protoplasm of reacting to a stimulus. [L. irritabilitas, fr. irrito, pp. -atus, to excite] - electric i. the response of a nerve or muscle to the ...
irritable
1. Capable of reacting to a stimulus. 2. Tending to react immoderately to a stimulus. Cf.:excitable.
Irritable bowel syndrome (IBS)
A common gastrointestinal disorder involving an abnormal condition of gut contractions (motility) characterized by abdominal pain, bloating, mucous in stools, and irregular bowel ...
irritant
1. Irritating; causing irritation. 2. Any agent with this action. - primary i. a substance that causes inflammation and other evidence of irritation, particularly of the skin, on ...
Irritant contact dermatitis
A rash brought about by constant irritation from a substance. For example, anyone who washes their hands many times a day can develop "dish pan hands." Another example is in young ...
irritation
1. Extreme incipient inflammatory reaction of the tissues to an injury. 2. The normal response of nerve or muscle to a stimulus. 3. The evocation of a normal or exaggerated ...
irritative
Causing irritation.
irrumation
SYN: fellatio. [L. irrumo, pp. -atus, to give suck]
irruption
Act or process of breaking through to a surface. [L. irruptio, fr. irrumpo, to break in]
irruptive
Relating to or characterized by irruption.
IRS-1
Abbreviation for insulin receptor substrate-1.
IRV
Abbreviation for inspiratory reserve volume.
Irvine
A. Ray, Jr., U.S. ophthalmologist, *1917. See I.- Gass syndrome.
ISA
Abbreviation for intrinsic sympathomimetic activity.
Isamine blue
SYN: pyrrol blue.
isauxesis
Growth of parts at the same rate as growth of the whole. [G. isos, even, + auxesis, increase]
Ischemia
: Inadequate blood supply (circulation) to a local area due to blockage of the blood vessels to the area. * * * Local anemia due to mechanical obstruction (mainly arterial ...
ischemic
Relating to or affected by ischemia.
ischesis
Suppression of any discharge, especially of a normal one. [G. ischo, to hold back]
ischia
Plural of ischium.
ischiadic
SYN: sciatic (1).
ischiadicus
SYN: sciatic. [L.]
ischial
SYN: sciatic (1).
ischialgia
1. Obsolete term for pain in the hip; specifically, the ischium. SYN: ischiodynia. 2. Obsolete term for sciatica. [G. ischion, hip, + algos, pain]
ischiatic
SYN: sciatic (1).
ischio-
The ischium. [G. ischion, hip joint, haunch (ischium)]
ischioanal
Relating to the ischium and the anus.
ischiobulbar
Relating to the ischium and the bulb of the penis.
ischiocapsular
Relating to the ischium and the capsule of the hip joint; denoting that part of the capsule which is attached to the ischium.
ischiocavernosus
See ischiocavernous (muscle).
ischiocavernous
Relating to the ischium and the corpus cavernosum.
ischiocele
SYN: sciatic hernia. [ ischio- + G. kele, hernia]
ischiococcygeal
Relating to the ischium and the coccyx.
ischiococcygeus
SYN: coccygeus muscle. See muscle.
ischiodynia
SYN: ischialgia (1). [ ischio- + G. odyne, pain]
ischiofemoral
Relating to the ischium, or hip bone, and the femur, or thigh bone.
ischiofibular
Relating to or connecting the ischium and the fibula.
ischiomelus
Unequal conjoined twins in which the parasite, often only an arm or a leg, arises from the pelvic region of the autosite. See conjoined twins, under twin. [ ischio- + G. melos, ...
ischionitis
Inflammation of the ischium.
ischiopagus
Conjoined twins united in their ischial region. See conjoined twins, under twin. [ ischio- + G. pagos, fixed]
ischioperineal
Relating to the ischium and the perineum.
ischiopubic
Relating to both ischium and pubis.
ischiorectal
Relating to the ischium and the rectum.
ischiosacral
Relating to the ischium and the sacrum.
ischiothoracopagus
SYN: iliothoracopagus.
ischiotibial
Relating to or connecting the ischium and the tibia.
ischiovaginal
Relating to the ischium and the vagina.
ischiovertebral
Relating to the ischium and the vertebral column.
ischium
The lower and posterior part of the hip bone, distinct at birth but later becoming fused with the ilium and pubis; it consists of a body, where it joins the ilium and superior ...
ischochymia
Retention of food in the stomach due to dilation of that organ. [G. ischo, to keep back, + chymos, juice]
ischuretic
1. Relating to or relieving ischuria. 2. An agent that relieves retention or suppression of urine.
ischuria
Retention or suppression of urine. [G. ischo, to keep back, + ouron, urine]
isethionate
A salt or ester of isethionic acid.
isethionic acid
2-Hydroxyethanesulfonic acid; a colorless viscous liquid, miscible with water and alcohols, that forms crystalline salts with organic acids.
Ishak
See Luna-I. stain.
Ishihara
Shinobu, Japanese ophthalmologist, 1879–1963. See I. test.
ISI
Abbreviation for international sensitivity index.
isinglass
SYN: ichthyocolla. [Old Ger. huysenblas, sturgeon's bladder]
island
In anatomy, any isolated part, separated from the surrounding tissues by a groove, or marked by a difference in structure. SYN: insula (2) [TA]. [A.S. igland] - blood i. an ...
islet
A small island. - blood i. SYN: blood island. - islets of Langerhans cellular masses varying from a few to hundreds of cells lying in the interstitial tissue of the pancreas; ...
Islets of Langerhans
Known as the insulin-producing tissue, the islets of Langerhans do more than that. They are groups of specialized cells in the pancreas that make and secrete hormones. Named ...
iso-
1. Prefix meaning equal, like. 2. In chemistry, prefix indicating “isomer of” (isomerism); e.g., isocyanate vs. cyanate. 3. In immunology, prefix designating sameness with ...
iso-osmotic
SYN: isosmotic.
isoacceptor tRNA
Different tRNA species that bind to alternate codons for the same amino acid residue; can be one tRNA that recognizes the various codons that signify those for the particular ...
isoagglutination
Agglutination of red blood cells as a result of the reaction between an isoagglutinin and specific antigen in or on the cells. SYN: isohemagglutination. [ iso- + L. ad, to, + ...
isoagglutinin
An isoantibody that causes agglutination of cells of genetically different members of the same species. SYN: isohemagglutinin.
isoagglutinogen
An isoantigen that induces agglutination of the cells to which it is attached upon exposure to its specific isoantibody.
isoallele
One of a number of alleles that can be distinguished only by special analyses.
isoalloxazine
The heterocyclic compound that forms the structural foundation of riboflavin and other flavins.
isoaminile
An antitussive agent.
isoamyl
See amyl.
isoamylase
A hydrolase that cleaves 1,6-α-d-glucosidic branch linkages in glycogen, amylopectin, and their β-limit dextrins; part of the complex known as debranching enzyme; similar to ...
isoandrosterone
SYN: epiandrosterone.
isoantibody
1. An antibody that occurs only in some individuals of a species and reacts specifically with a particular foreign isoantigen. For specific isoantibodies of blood group s, see ...
isoantigen
1. An antigenic substance that occurs only in some individuals of a species, such as the blood group antigens of humans. For specific isoantigens of blood group s, see the ...
isobar
1. One of two or more nuclides having the same total number of protons plus neutrons, but with different distribution; e.g., argon-40 with 18 protons and 22 neutrons, ...
isobaric
1. Having equal weights or pressures. 2. With respect to solutions, having the same density as the diluent or medium; e.g., in spinal anesthesia, an i. solution has the same ...
isobornyl thiocyanoacetate
C13H19NO2S; a pediculicide.
isobutane
See butane.
isobuteine
S-(2-Carboxypropyl)cysteine; a sulfur-containing compound found in urine.
isobutyl nitrite
A liquid present in commercial amyl nitrite, with similar antispasmodic and vasodilator properties.
isobutyric acid
See butyric acid.
isocapnia
A state in which the arterial carbon dioxide pressure remains constant or unchanged. [ iso- + G. kapnos, vapor]
isocellular
Composed of cells of equal size or of similar character. [ iso- + L. cellula, dim. of cella, a storeroom]
isochoric
SYN: isovolumic. [ iso- + G. chora, space]
isochromatic
1. Of uniform color. SYN: isochroous. 2. Denoting two objects of the same color. [ iso- + G. chroma, color]
isochromatophil, isochromatophile
Having an equal affinity for the same dye; said of cells or tissues. [ iso- + G. chroma, color, + philos, fond]
Isochromosome
An abnormal chromosome with two identical arms due to duplication of one arm and loss of the other arm. (Found in some girls with Turner syndrome and in tumors.) * * * A ...
isochronia
1. The state of having the same chronaxie. 2. Agreement, with respect to time, rate, or frequency, between processes. [ iso- + G. chronos, time]
isochronous
Occurring during the same time.
isochroous
SYN: isochromatic (1).
isocitrase, isocitratase
SYN: isocitrate lyase.
isocitrate
A salt or ester of isocitric acid. - i. dehydrogenase one of two enzymes that catalyze the conversion of threo-ds-i., the product of the action of both aconitase and i. lyase, ...
isocitric acid
An intermediate in the tricarboxylic acid cycle. - i. dehydrogenase SYN: isocitrate dehydrogenase.
isocitritase
SYN: isocitrate lyase.
isocline
A line in a geographical region that joins all points at which in a population there is the same average frequency for the various alleles at a genetic locus. SEE ALSO: cline. [ ...
isoconazole
Antibacterial and antifungal related to ketoconazole and oxiconazole.

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