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PCO disease
PCO stands for polycystic ovarian. PCO disease is an hormonal problem that causes women various symptoms including: {{}}Irregular or no periods Acne Obesity, and Excess ...
Pco2, pCO2
Symbol for partial pressure (tension) of carbon dioxide. See partial pressure.
PCP
Pneumocystis carinii pneumonia. A parasitic infection of the lungs that is particularly common and life-threatening in immunosuppressed persons. Prophylaxis is available to ...
PCR
Abbreviation for polymerase chain reaction.
PCR (polymerase chain reaction)
A key technique in molecular genetics that permits the analysis of any short sequence of DNA (or RNA) without having to clone it. PCR is used to amplify selected sections of ...
PCT
The abbreviation "PCT" stands for a number of things including porphyria cutanea tarda, literally, the late skin form of porphyria, a genetic photosensitive (light-sensitive) ...
PCWP
Abbreviation for pulmonary capillary wedge pressure.
PD
Abbreviation for phenyldichloroarsine.
Pd
Symbol for palladium.
PDGF
Abbreviation for platelet-derived growth factor.
PDI
Abbreviation for Periodontal Disease Index.
PDL
Abbreviation for pulsed dye laser.
PDR
Physicians’ Desk Reference (please see entry to Physicians’ Desk Reference). PDR less frequently stands for "postdelivery room".
PEA
Abbreviation for pulseless electrical activity.
peach kernel oil
See persic oil.
peak
The top or upper limit of a graphic tracing or of any variable. [M.E. peke, pike, fr. Sp. pico, beak, fr. L. picus, magpie] - biclonal p. two narrow electrophoretic bands ...
Peak-flow meter
This hand-held device measures air flow (how fast air is blown out of the lungs). Patients can use peak-flow meters to measure their own air flow regularly. The use of a peak-flow ...
Peanut allergy
An allergic reaction to peanuts, the leading cause of anaphylaxis, the most severe and potentially life threatening allergic reaction, and the leading cause of death from food ...
peanut oil
Oil extracted from the kernels of one or more cultivated varieties of Arachis hypogaea (family Leguminosae); used as a solvent for intramuscular injections and in the preparation ...
Pearl
Raymond, U.S. biologist, 1879–1940. See P. index.
pearl
1. A concretion formed around a grain of sand or other foreign body within the shell of certain mollusks. 2. One of a number of small tough masses, such as mucus occurring in ...
pearl-ash
SYN: potash.
Pearson
Karl, English mathematician, 1857–1936. See Poisson-P. formula, McArdle-Schmid-P. disease.
peau d'orange
A swollen pitted skin surface overlying carcinoma of the breast in which there is both stromal infiltration and lymphatic obstruction with edema. [Fr. orange peel]
peccant
Unhealthy; producing disease. [L. peccans (-ant-), pres. p. of pecco, to sin]
peccatiphobia
Morbid fear of sinning. [L. peccatum,, sin, + G. phobos, fear]
pecilo-
See poikilo-.
pecilocin
An antifungal agent.
Pecquet
Jean, French anatomist, 1622–1674. See P. cistern, P. duct, receptaculum pecqueti, P. reservoir.
Pecs
Slang for the pectoral muscles, muscles of the “anterior chest” (the front of the chest). The Latin “pectus” means “chest.”
pectase
An enzyme that converts pectin to d-galacturonic acid ( pectic acid); used in the treatment of certain foodstuffs. SYN: pectinesterase.
pecten
1. [NA] A structure with comblike processes or projections. 2. SYN: anal p.. [L. comb] - anal p. [TA] the middle third of the surgical anal canal; upper half of anatomic anal ...
pectenitis
Inflammation of the sphincter ani. [L. pecten, a comb, + G. -itis, inflammation]
pectenosis
Exaggerated enlargement of the pecten band.
pectic
Relating to any of the substances or materials now referred to as pectin. [G. pektos, stiff, curdled]
pectic acid
SYN: d-galacturonic acid.
pectin
1. Broad generic term for what are now called pectic substances or materials; specifically, a gelatinous substance, consisting largely of long chains of mostly d-galacturonic ...
pectinase
SYN: polygalacturonase.
pectinate
1. Combed; comb-shaped. SYN: pectiniform. 2. In fungi, used to describe a particular type of branching hyphae in cultures of dermatophytes.
pectineal
Ridged; relating to the os pubis or to any comblike structure. SYN: pectineus (1).
pectinesterase
SYN: pectase.
pectineus
1. SYN: pectineal. 2. See p. (muscle). [L.]
pectinic acids
Term sometimes used for commercial pectins.
pectiniform
SYN: pectinate (1).
pectization
In colloidal chemistry, coagulation. [G. pektikos, curdling]
pectoral
Relating to the chest. [L. pectoralis; fr. pectus, breast bone]
Pectoral muscles
Muscles of the “anterior chest” (the front of the chest). Familiarly called the pecs. The Latin “pectus” means “chest.”
pectoralgia
Pain in the chest. [L. pectus (pector-), chest, + G. algos, pain]
Pectoralis muscle absence with syndactyly
A unique pattern of one-sided malformations characterized by a defect of the chest (pectoralis) muscle on one side of the body and webbing of the fingers (cutaneous syndactyly) ...
pectoriloquy
Increased transmission of the voice sound through the pulmonary structures, so that it is clearly audible on auscultation of the chest; usually indicates consolidation of the ...
pectorophony
SYN: pectoriloquy. [L. pectus, chest, + G. phone, voice]
pectose
See pectin, protopectin.
pectous
1. Relating to or consisting of pectin or pectose. 2. Denoting a firm coagulated condition sometimes assumed by a gel, which is permanent in that the substance cannot be made ...
pectus
SYN: chest. [L.] - p. carinatum flattening of the chest on either side with forward projection of the sternum resembling the keel of a boat. SYN: chicken breast, keeled chest, ...
Pectus carinatum
Pigeon-breasted. In Latin “pectus” means “chest” and “carina” keel = a chest shaped like the keel of a boat (looking at the keel from outside the boat).
Pectus excavatum
Caved-in or funnel chest. The Latin “pectus” means “chest.” The chest is excavated. It looks as if it has been dug out, hollowed out.
ped-, pedi-, pedo-
1. Child. [G. pais, child] 2. Foot, feet. [L. pes, foot]
pedal
Relating to the feet, or to any structure called pes. [L. pedalis, fr. pes (ped-), a foot]
pedatrophia, pedatrophy
SYN: marasmus. [G. pais (paid-), child, + atrophy]
pederast
One who practices pederasty.
pederasty
Homosexual anal intercourse, especially when practiced on boys. [G. paiderastia; fr. pais (paid-), boy, + erao, to long for]
Pedersen speculum
See under speculum.
pedesis
SYN: brownian movement. [G. p., a leaping]
pedi-
See ped-.
pediatric
Relating to pediatrics. [G. pais (paid-), child, + iatrikos, relating to medicine]
Pediatric arthritis
Arthritis is not just a problem for the retired. It can and does affect children in the form of pediatric arthritis. Also called
Pediatric rheumatologist
A physician who specializes in providing comprehensive care to children (as well as their families) with rheumatic diseases, especially arthritis. Pediatric rheumatologists are ...
pediatrician
A specialist in pediatrics. SYN: pediatrist.
Pediatrics
"Pediatrics is concerned with the health of infants, children and adolescents, their growth and development, and their opportunity to achieve full potential as adults." ...
pediatrist
SYN: pediatrician.
pediatry
A rarely used term for pediatrics
pedicel
The secondary process of a podocyte, which helps form the visceral capsule of a renal corpuscle. SYN: footplate (2), foot-plate, foot process. [Mod. L. pedicellus, dim. of L. ...
pedicellate
SYN: pediculate.
pedicellation
Formation of a pedicle or peduncle.
pedicle
1. A constricted portion or stalk. SYN: pediculus (1) [TA]. 2. A stalk by which a nonsessile tumor is attached to normal tissue. SYN: pedunculus [TA], peduncle (2). 3. A ...
pedicular
Relating to pediculi, or lice. [L. pedicularis]
pediculate
Not sessile, having a pedicle or peduncle. SYN: pedicellate, pedunculate. [L. pediculatus]
pediculi
Plural of pediculus. [L.]
pediculicide
An agent used to destroy lice. [L. pediculus, louse, + caedo, to kill]
Pediculoides ventricosus
SYN: Pyemotes tritici. [Mod. L., fr. L. pediculus, louse, + venter, belly]
pediculophobia
Morbid fear of infestation with lice. SYN: phthiriophobia. [L. pediculus, louse, + G. phobos, fear]
Pediculosis
Infested with lice. Head lice (Pediculus humanus capitis) are parasitic insects found on the heads of people. Having head lice is very common. Anyone can get head lice who comes ...
pediculous
Infested with lice. SYN: lousy.
Pediculus
A genus of parasitic lice (family Pediculidae) that live in the hair and feeds periodically on blood. Important species include P. humanus, the species of louse infecting humans; ...
pediculus
1. SYN: pedicle (1). [L. pedicle] 2. A louse. See P.. [L.] - p. arcus vertebrae [TA] SYN: pedicle of arch of vertebra.
pedicure
Care and treatment of the feet. [L. pes (ped-), foot, + cura, treatment]
Pedigree
In medicine, a pedigree is a family health history diagrammed with a set of international symbols to indicate the individuals in the family, their relationships to one another, ...
pediophobia
Morbid fear aroused by the sight of a child or of a doll. [G. paidion, a little child, + phobos, fear]
pediphalanx
A phalanx of the foot, distinguished from maniphalanx. [L. pes (ped-), foot, + phalanx]
pedo-
See ped-.
pedodontia
SYN: pedodontics.
pedodontics
The branch of dentistry concerned with the dental care and treatment of children. SYN: pediatric dentistry, pedodontia. [G. pais, child, + odous, tooth]
pedodontist
A dentist who practices pedodontics.
pedodynamometer
An instrument for measuring the strength of the leg muscles. [L. pes (ped-), foot, + G. dynamis, force, + G. metron, measure]
pedogenesis
Permanent larval stage with sexual development, as in certain gall midges (genus Miastor). Cf.:neoteny. [G. pais (paid-), child, + genesis, origin]
pedogram
A record made by the pedograph.
pedograph
An instrument for recording and studying the gait. [L. pes (ped-), foot, + G. grapho, to write]
pedography
Production of a record as made by a pedograph.
pedometer
An instrument for measuring the distance covered in walking. SYN: podometer. [L. pes (ped-), foot]
pedomorphism
Description of adult behavior in terms appropriate to child behavior. [G. pais (paid), child, + morphe, form]
Pedophilia
: Sexual fondness and activity of adults with children. Pedophilia is a form of paraphilia (deviant sexual behavior). Pedophilia is sexual child abuse. Child abuse comprises ...
pedophilic
Relating to or exhibiting pedophilia.
Pedophobia
An abnormal and persistent fear of babies and children. Sufferers experience anxiety even though they realize their fear is groundless. Rearing a child or being around active ...
peduncle
1. In neuroanatomy, term loosely applied to a variety of stalklike connecting structures in the brain, composed either exclusively of white matter ( e.g., cerebellar p.) or of ...
peduncular
Relating to a pedicle or peduncle.
pedunculate
SYN: pediculate.
pedunculotomy
1. A total or partial section of a cerebral peduncle. 2. A mesencephalic pyramidal tractotomy. [ peduncle + G. tome, incision]
pedunculus
SYN: pedicle (2). [Mod. L. dim. of pes, foot] - p. cerebellaris inferior [TA] SYN: inferior cerebellar peduncle. - p. cerebellaris medius [TA] SYN: middle cerebellar ...
peel
To remove the outer layer of. - face p. removal of skin blemishes such as wrinkles, freckles, or acne scars by chemical agents producing injury (trichloracetic, phenol, or other ...
peeling
A stripping off or loss of epidermis, as in sunburn. [M.E. pelen] - chemical p. SYN: chemexfoliation.
peenash
Rhinitis caused by insect larvae in the nasal passages. [East Indian]
PEEP
Abbreviation for positive end- expiratory pressure.
Peer review
Scrutiny by one’s peers (equals). Peer-reviewed articles appearing in medical journals have been scrutinized by members of the biomedical community before publication. * * ...
PEG
Stands for percutaneous endoscopic gastrostomy, a surgical procedure for placing a feeding tube without having to perform an open laparotomy (operation on the abdomen). The aim ...
PEGs
Abbreviation for polyethylene glycols.
Peiffer
J., German physician, *1922. See Hirsch-P. stain.
pejorism
A pessimistic attitude. [L. pejor, worse]
PEL
Abbreviation for permissible exposure limit.
Pel
Pieter K., Dutch physician, 1852–1919. See P.- Ebstein disease, P.- Ebstein fever.
pelade
SYN: alopecia. [Fr. peler, to remove the hair from a hide]
pelargonic acid
Used in the manufacture of lacquers and plastics; produced in the oxidative cleavage of oleic acid. SYN: n-nonanoic acid.
Pelger
Karel, Dutch physician, 1885–1931. See P.- Huët nuclear anomaly.
peliosis
SYN: purpura. [G. p., a livid spot, livor] - bacterial p. bacterial infection of hemorrhagic cysts of the liver, spleen, or lymph node s, seen in immunocompromised persons, ...
Pelizaeus
Friedrich, German neurologist, 1850–1917. See Merzbacher-P. disease, P.- Merzbacher disease.
Pelizaeus-Merzbacher disease (PMD)
An X-linked disorder of the central nervous system (CNS) in which there is loss of myelin (the sheath around the nerve protecting it). PMD affects boys and is characterized by ...
Pellagra
A syndrome due to deficiency of niacin, one of the B-complex vitamins. Pellagra was known as the "disease of the four D's" — dermatitis, diarrhea, dementia and death. The ...
pellagroid
Resembling pellagra.
pellagrous
Relating to or suffering from pellagra.
Pellegrini
Augusto, Italian surgeon, *1877. See P. disease, P.- Stieda disease.
pellet
1. A pilule, or very small pill. 2. A small rod-shaped or ovoid dosage form that is sterile and is composed essentially of pure steroid hormones in compressed form, intended ...
pellicle
1. Literally and nonspecifically, a thin skin. 2. A film or scum on the surface of a liquid. 3. Cell boundary of sporozoites and merozoites among members of the protozoan ...
pellicular, pelliculous
Relating to a pellicle.
Pellizzari
Pietro, Italian dermatologist, 1823–1892. See Jadassohn-P. anetoderma.
Pellizzi
G.B., 19th–20th century Italian physician. See P. syndrome.
pellote
SYN: peyote. [Aztec, peyotl]
pellucid
Allowing the passage of light. [L. pellucidus]
pelma
SYN: sole. [G.]
pelmatic
Relating to the sole of the foot. [G. pelma, sole]
pelmatogram
An imprint of the sole of the foot, made by resting the inked foot on a sheet of paper, or by pressing the greased foot on a plaster of Paris paste. [G. pelma (pelmat-), sole ...
pelopathy
SYN: pelotherapy. [G. pelos, mud, + pathos, suffering]
pelotherapy
Application of peloids, such as mud, peat, or clay, to all or part of the body. SYN: pelopathy. [G. pelos, mud, + therapeia, treatment]
pelta
A crescentic, silver-staining, membranous organelle located anteriorly near the base of the flagella in certain flagellate protozoa, as in Trichomonas. [L. a shield]
peltation
Protection provided by inoculation with an antiserum or with a vaccine. [L. pelta, a light shield, fr. G. pelte]
pelvi-, pelvio-, pelvo-
The pelvis. Cf.:pyelo-, pelyco-. [L. pelvis, basin (pelvis)]
Pelvic
: Having to do with the pelvis, the lower part of the abdomen, located between the hip bones. * * * Relating to a pelvis.
pelvic direction
The direction of the axis of the pelvis.
Pelvic exam
An examination of the organs of the female reproductive system. In a pelvic exam, a speculum (an instrument for opening and widening certain passages of the body) is used to ...
Pelvic inflammatory disease (PID)
Ascending infection of the female upper genital tract (the female structures above the cervix). PID is the most common and serious complication of sexually transmitted diseases ...
pelvicephalography
SYN: cephalopelvimetry. [pelvi- + G. kephale, head, + grapho, to write]
pelvicephalometry
Measurement of the female pelvic diameters in relation to those of the fetal head. [pelvi- + G. kephale, head, + metron, measure]
pelvifixation
Surgical attachment of a floating pelvic organ to the wall of the pelvic cavity.
pelvilithotomy
SYN: pyelolithotomy. [pelvi- + G. lithos, stone, + tome, incision]
pelvimetry
Measurement of the diameters of the pelvis. SYN: radiocephalpelvimetry. [pelvi- + G. metron, measure] - CT p. procedure for measurement of the bony pelvis and fetal head through ...
pelvio-
See pelvi-.
pelviolithotomy
SYN: pyelolithotomy.
pelvioperitonitis
SYN: pelvic peritonitis.
pelvioplasty
SYN: pyeloplasty. [ pelvio- + G. plastos, formed]
pelvioscopy
Examination of the pelvis for any purpose, usually by endoscopy. SYN: pelvoscopy. [ pelvio- + G. skopeo, to view]
pelviperitonitis
SYN: pelvic peritonitis.
Pelvis
: The lower part of the abdomen located between the hip bones. Organs in the female pelvis include the uterus, vagina, ovaries, fallopian tubes, bladder, and rectum. * * * 1. ...
Pelvis, android
There are significant differences in the anatomy of the pelvis in the female and male. The android or male pelvis is more robust, narrower, and taller than the female pelvis. ...
Pelvis, female
There are significant differences in the anatomy of the pelvis in the female and male. The female pelvis is more delicate, wider and not as high as the male pelvis. The angle ...
Pelvis, male
There are significant differences in the anatomy of the pelvis in the female and male. The male pelvis is more robust, narrower, and taller than the female pelvis. The angle of ...
pelvisacral
Relating to both the pelvis, or hip bones, and the sacrum.
pelviscope
Endoscopic instrument for examining the interior of the pelvis. [pelvi- + G. skopeo, to view]
pelvitherm
Instrument for applying heat to the pelvic organs. [pelvi- + G. therme, heat]
pelviureterography
SYN: pyelography.
pelvo-
See pelvi-.
pelvocaliectasis
SYN: hydronephrosis.
pelvocephalography
SYN: cephalopelvimetry.
pelvoscopy
SYN: pelvioscopy.
pelvospondylitis ossificans
Deposit of bony substance between the vertebrae of the sacrum. [L. pelvis, basin, + G. spondylos, vertebra, + -itis; L. os, bone, + facio, to make]
pelyco-
The pelvis. See pelvi-. [G. pelyx, bowl (pelvis)]
pemoline
A psychostimulant used in the treatment of attention deficit disorder ( hyperactivity) in children.
pemphigoid
1. Resembling pemphigus. 2. A disease resembling pemphigus but significantly distinguishable histologically (nonacantholytic) and clinically (generally benign course). [G. ...
pemphigus
1. Autoimmune bullous diseases with acantholysis : p. vulgaris, p. foliaceus, p. erythematosus, or p. vegetans. 2. A nonspecific term for blistering skin diseases. [G. ...
pempidine
Secondary amine of the mecamylamine group, effective as a ganglionic blocking agent; also available as p. tartrate, with the same uses.
pendelluft
Transient movement of gas out of some alveoli and into others when flow has just stopped at the end of inspiration, or such movement in the opposite direction just at the end of ...
Pendred
Vaughan, English surgeon, 1869–1946. See P. syndrome.
Pendred syndrome
Pendred syndrome (PDS) is the hereditary association of congenital deafness (deafness at the time of birth) and goiter (enlargement of the thyroid gland in the front of the neck) ...
penectomy
SYN: phallectomy. [L. penis + G. ektome, excision]
penes
Plural of penis, as in diphallus.
Penetrance
The likelihood a given gene will result in disease. For example, if half (50%) of the people with the neurofibromatosis (NF) gene have the disease NF, the penetrance of the NF ...
Penetrant trait
A genetic trait (characteristic) that is present in the genome and manifests itself in the individual. By contrast, a nonpenetrant trait is one that, although present, does not ...
penetrate
To pierce; to pass into the deeper tissues or into a cavity.
penetration
1. A piercing or entering. 2. Mental acumen. 3. SYN: focal depth. [L. penetratio, fr. penetro, pp. -atus, to enter]
penetrometer
An obsolete instrument for measuring the penetrating power of x-rays from any given source. [ penetration + G. metron, measure]
penial
SYN: penile.
peniaphobia
Morbid fear of poverty. [G. penia, poverty, + phobos, fear]
penicillamine
A degradation product of penicillin; a chelating agent used in the treatment of lead poisoning, hepatolenticular degeneration, and cystinuria, and in the removal of excess ...
penicillanate
A salt of penicillanic acid.
penicillanic acid
A penicillin without the characterizing R group (with H– replacing ROONH–) of penicillin.
penicillary
Denoting a penicillus (1).
penicillate
1. Pertaining to a penicillus. 2. Having a tuftlike structure.
penicillic acid
An antibiotic produced by Penicillium puberulum, a mold found on maize, and from P. cyclopium; active against Gram-positive and Gram-negative bacteria but toxic to animal ...
Penicillin
Historically, the most famous of all antibiotics, named for the fungal mould Penicillium notatum from which it is derived. Penicillin acts by destroying the cell wall in those ...
Penicillin-resistant bacteria
Bacteria that are unaffected by penicillin. Such organisms can sometimes be killed using sulfa drugs, combinations of several medications, or other tactics, but some resistant ...
penicillinase
1. SYN: β-lactamase. 2. A purified enzyme preparation obtained from cultures of a strain of Bacillus cereus; formerly used in the treatment of slowly developing or delayed ...
penicillinate
A salt of a penicillic acid ( i.e., of a penicillin).
penicilliosis
Invasive infection by a species of Penicillium.
Penicillium
A genus of fungi (class Ascomycetes, order Aspergillales), species of which yield various antibiotic substances and biologicals; e.g., citrinum yields citrinin; P. claviforme, P. ...
penicilloic acid
Alkali and bacterial degradation product of a penicillin, resulting from hydrolysis of the 1,7 bond.
penicilloyl polylysine
A preparation of polylysine and a penicillic acid, used intradermally in the diagnosis of penicillin sensitivity; sensitive persons may react with systemic manifestations, ...
penicillus
1. [NA] One of the tufts formed by the repeated subdivision of the minute arterial twigs in the spleen. 2. In fungi, one of the branched conidiophores bearing chains of conidia ...
penicin
SYN: 6-aminopenicillanic acid.
penile
Relating to the penis. SYN: penial.
penillic acids
Acid degradation products of penicillins, produced by cleavage of the 1,7 bond, forming penicilloic acid, and formation of a bond between the exocyclic carbonyl carbon and N-1 ...
penin
6-Aminopenicillanic acid; an intermediate in the synthesis of penicillins.
Penis
The external male sex organ. The penis contains two chambers, the corpora cavernosa, which run the length of the organ. These are filled with spongy tissue and surrounded by a ...
Penis, erection of the
When the penis fills with blood and is rigid. The penis contains two chambers, called the corpora cavernosa, which run the length of the organ, are filled with spongy tissue, ...
Penis, hypospadias of the
birth defect of the penis involving the urethra (the transport tube leading from the bladder to discharge urine outside the body). The urethra in the male normally travels through ...
Penis, inflammation of the foreskin & glans
In the uncircumcised male, balanitis (inflammation of the glans, the rounded head of the penis) and posthitis (inflammation of the foreskin) usually occur together as ...
Penis, inflammation of the head of the
Inflammation of the rounded head (the glans) of the penis is called balanitis. In the uncircumcised male, balanitis and posthitis (inflammation of the foreskin) usually occur ...
Penis, small
A penis that is abnormally small is referred to as a micropenis. In medical practice, the dimension of the penis that is measured is the length. The measurement is taken along ...
penischisis
A fissure of the penis resulting in an abnormal opening into the urethra, either above (epispadias), below (hypospadias), or to one side (paraspadias). [L. penis + G. schisis, ...
pennate
Feathered; resembling a feather. SYN: penniform. [L. pennatus, fr. penna, feather]
penniform
SYN: pennate. [L. penna, feather, + forma, form]
pennyroyal
A name in folk medicine given to Mentha pulegium (an aromatic p.), or to Hedeoma pulegeoides (American p.) (family Labiatae); an aromatic stimulant formerly used as an ...
penoscrotal
Relating to both penis and scrotum.
penotomy
SYN: phallotomy. [L. penis + G. tome, a cutting]
Penrose
Charles B., U.S. gynecologist, 1862–1925. See P. drain.
penta-
Combining form denoting five. [G. pente, five]
pentabasic
Denoting an acid having five replaceable hydrogen atoms. [ penta- + G. basis, base]
pentachlorophenol
Insecticide for termite control; preharvest defoliant; general herbicide. Has been used extensively for use in the preservation of wood, wood products, starches, dextrins, glues. ...
pentad
1. A collection of five things in some way related. 2. In chemistry, a pentavalent element. [G. pentas, the number five] - Reynolds p. abdominal pain, fever, jaundice, shock, ...
pentadactyl, pentadactyle
Having five fingers or toes on each hand or foot. SYN: quinquedigitate. [ penta- + G. daktylos, finger]
pentaerythritol
The tetranitrate is a coronary vasodilator with action similar to that of other slow-acting organic nitrates.
pentaerythritol tetranitrate
An organic nitrate used as a vasodilator in the treatment of angina pectoris; exerts a longer duration of action than nitroglycerin; acts via conversion to nitric oxide.
pentagastrin
The substituted pentapeptide, BOC-β-Ala-Trp-Met-Asp-Phe(NH2); a gastric acid stimulator.
pentalogy
A rarely used term for a combination of five elements, such as five concurrent symptoms. [ penta- + G. logos, treatise, word] - p. of Cantrell a congenital defect involving a ...
pentamer
See virion. [ penta- + G. meros, part]
pentamidine isethionate
A toxic but effective drug used in the prophylaxis and treatment of early stages of both types of African sleeping sickness (Gambian and Rhodesian trypanosomiasis). It does not ...
pentanoic acid
SYN: valeric acid.
pentapeptide
A compound containing five amino acid residues linked via peptide bonds.
pentapiperide fumarate
An intestinal antispasmodic.
pentapiperium methylsulfate
An anticholinergic agent.
pentaquine
An antimalarial agent closely related chemically to pamaquine but less toxic and more effective; it is administered with quinine, the two drugs acting synergically; active ...
Pentastoma
Older name for a genus of Pentastomida, now called Linguatula. The species described as P. denticulatum proved to be the larva of Linguatula rhinaria, sometimes parasitic in ...
pentastomiasis
Infection of herbivorous animals, swine, and humans with larval tongue worms; lesions occur principally in the lymph node s of the digestive tract, where they often resemble ...
Pentastomida
The tongue worms, a group of parasitic wormlike animals considered to form a distinct phylum thought to be descended from primitive arthropods, though modified by parasitism to ...
pentatomic
Denoting five atoms per molecule. [ penta- + atomic]
Pentatrichomonas
A genus of parasitic protozoan flagellates, formerly part of the genus Trichomonas but now separated as a distinct genus by the presence of five anterior flagella and a granular ...
pentavalent
Having a combining power (valence) of five. SYN: quinquevalent.
pentazocine
An opioid agonist/antagonist analgesic with some addiction liability but only rare withdrawal syndrome and tolerance; very irritating to tissues on local injection; available ...
pentetate trisodium calcium
The calcium trisodium salt of pentetic acid. SYN: calcium trisodium pentetate.
pentetic acid
A pentaacetic acid triamine with affinity for heavy metals; used as the calcium sodium chelate in the treatment of iron-storage disease and poisoning from heavy metals and ...
penthienate bromide
An anticholinergic agent.
pentifylline
A vasodilator; has more lipid solubility than theobromine.
pentitol
A reduced pentose; e.g., ribitol, lyxitol, xylitol.
pentobarbital
An oral and intravenous sedative and short-acting hypnotic barbiturate; largely replaced by benzodiazepines.
pentolinium tartrate
A quaternary ammonium compound with potent ganglionic blocking action; used in the management of severe and malignant hypertension and peripheral vasospastic diseases.
penton
The pentagonal capsomere (p. base) along with the protruding fiber at each of the 12 vertices of the adenovirus capsid; antigenically, the p. base differs from the fiber, and ...
pentosan
A poly- or oligosaccharide of a pentose; e.g., arabans, xylans.
pentose
A monosaccharide containing five carbon atoms in the molecule; e.g., arabinose, lyxose, ribose, xylose, xylulose. - p. nucleotide a nucleotide having a p. as the sugar ...
pentostatin
An antineoplastic; a potent inhibitor of adenosine deaminase; interferes with the synthesis of nicotinamide adenine dinucleotide. SYN: 2-deoxycoformycin.
pentosuria
The excretion of one or more pentoses in elevated amounts in the urine. - alimentary p. the urinary excretion of l-arabinose and l-xylose, as the result of the excessive ...
pentoxide
An oxide containing five oxygen atoms; e.g., phosphorus p., P2O5.
pentoxifylline
A dimethylxanthine derivative that decreases blood viscosity and improves blood flow; used in the treatment of intermittent claudication.
pentulose
A ketopentose; e.g., ribulose, xylulose.
pentyl
1. SYN: amyl. 2. The CH3(CH2)3CH2— moiety.
pentylenetetrazol
A powerful stimulant to the central nervous system; has been used to cause generalized convulsion in the shock treatment of emotional states and as a respiratory stimulant; mainly ...
penumbra
The region of partial illumination or radiation caused by light or x-rays not originating from a point source; also called geometric unsharpness. [Mod. L., fr. L. paene, almost, ...
PEP
The abbreviation PEP stands for a number of things in medicine including post-exposure prophylaxis. Prophylaxis means a defense or protection. Post-exposure prophylaxis, for ...
peplomer
A part or knoblike subunit of the peplos of a virion, the assemblage of which produces the complete peplos; frequently a surface glycoprotein on lipoprotein envelope. [see ...
peplos
The coat or envelope of lipoprotein material that surrounds certain virions. [G. an outer garment worn by women]

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