| pentastichous | <botany> Having, or arranged in, five vertical ranks, as the leaves of an apple tree or a cherry tree. Origin: Penta- + Gr. A row. Source: Websters Dictionary (01 Mar 1998) |
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| Pentastoma | Older name for a genus of Pentastomida, now called Linguatula. The species described as Pentastoma denticulatum proved to be the larva of Linguatula rhinaria, sometimes parasitic in the nose of humans and other mammals; adults are found in the lungs of reptiles. Origin: penta-+ G. Stoma, mouth (05 Mar 2000) |
| pentastomiasis | Infection of herbivorous animals, swine, and man with larval tongue worms; lesions occur principally in the lymph nodes of the digestive tract, where they often resemble those of tuberculosis. (05 Mar 2000) |
| pentastomida | <zoology> Same as Linguatulina. Origin: NL, fr. (see Penta-) + a mouth. Source: Websters Dictionary (01 Mar 1998) |
| pentathionic | <chemistry> Pertaining to, or designating, an acid of sulphur obtained by leading hydrogen sulphide into a solution of sulphur dioxide; so called because it contains five atoms of sulphur. Origin: Penta- + thionic. Source: Websters Dictionary (01 Mar 1998) |
| pentatomic | <chemistry> Having five atoms in the molecule. Having five hydrogen atoms capable of substitution. Origin: Penta- + atomic. Source: Websters Dictionary (01 Mar 1998) |
| 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 parabasal body. The species Pentatrichomonas hominis lives as a commensal in the colon of man and other primates, dogs, cats, oxen, and various rodents. Origin: penta-+ Trichomonas (05 Mar 2000) |
| pentavalent | <chemistry> Having a valence of five; said of certain atoms and radicals. Origin: Penta- + L. Valens, p. Pr. See Valence. Source: Websters Dictionary (01 Mar 1998) |
| pentavalent gas gangrene antitoxin | Antitoxin specific for the toxin of one or more species of Clostridium that cause gaseous gangrene and associated toxaemia, especially C. Perfringens C. Novyi, C. Histolyticum, and commercially available preparations are usually polyvalent, i.e., contain antitoxin for two or more species. Synonym: pentavalent gas gangrene antitoxin. (05 Mar 2000) |
| pentazocine | <chemical> The first mixed agonist-antagonist analgesic to be marketed. It is an agonist at the kappa and sigma opioid receptors and has a weak antagonist action at the mu receptor. Pharmacological action: analgesics, opioid, anaesthesia adjuvants, narcotic antagonists, narcotics. Chemical name: 2,6-Methano-3-benzazocin-8-ol, 1,2,3,4,5,6-hexahydro-6,11-dimethyl-3-(3-methyl-2-butenyl)-, (2alpha,6alpha,11R*)- (12 Dec 1998) |
| pentacyclic |
(pen
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| pentaene |
(pen
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| pentaerythritol |
(pen
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| pentalogy |
(pen
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| pentalogy of Fallot |
the four defects of the tetralogy of Fallot accompanied by patent foramen ovale or atrial septal defect.
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