| pentamethylene | <chemistry> A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; so named because regarded as composed of five methylene residues. Cf. Trimethylene, and Tetramethylene. Origin: Penta- + methylene. Source: Websters Dictionary (01 Mar 1998) |
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| pentamidine | <drug> An antibiotic used in aerosol form as a prevention against PCP (aerosolised pentamidine) and used intravenously to treat PCP. Side effects of inhaled pentamidine can include coughing, lung contractions, shortness of breath and fatigue. Side effects of injected pentamidine can include low blood sugar, pancreatitis and kidney disease. (09 Oct 1997) |
| pentamidine isethionate | P,p'-(Pentamethylenedioxy)dibenzamidinebis(beta-hydroxyethanesulfonate);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 cross the blood-brain barrier and is not effective in the treatment of the advanced (neurological) stage of the disease. Also used to treat leishmaniasis that does not respond to therapy with pentavalent antimonials and in the treatment of pneumonia caused by Pneumocystis carinii. (05 Mar 2000) |
| pentandria | <botany> A Linnaean class of plants having five separate stamens. Origin: NL, fr. Gr. (see Penta-) +, man, male. Source: Websters Dictionary (01 Mar 1998) |
| pentandrous | <botany> Of or pertaining to the class Pentadria; having five stamens. Source: Websters Dictionary (01 Mar 1998) |
| pentane | <chemistry> Any one of the three metameric hydrocarbons, C5H12, of the methane or paraffin series. They are colourless, volatile liquids, two of which occur in petroleum. So called because of the five carbon atoms in the molecule. See: Penta-. Source: Websters Dictionary (01 Mar 1998) |
| pentanes | Five-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives. (12 Dec 1998) |
| pentanoic acid | CH3(CH2)3COOH;normal aliphatic acid; distilled from valerian; some of its salts are used in medicine; found in human colon. Synonym: pentanoic acid. (05 Mar 2000) |
| pentanols | Isomeric forms and derivatives of pentanol (c5h11oh). (12 Dec 1998) |
| pentanones | 5-carbon straight-chain or branched-chain ketones. (12 Dec 1998) |
| pentapeptide | A compound containing five amino acid residues linked via peptide bonds. (05 Mar 2000) |
| pentapetalous | <botany> Having five petals, or flower leaves. Origin: Penta- + petal. Source: Websters Dictionary (01 Mar 1998) |
| pentaphyllous | <botany> Having five leaves or leaflets. Origin: Penta- + Gr. Leaf. Source: Websters Dictionary (01 Mar 1998) |
| pentapiperide fumarate | 3-Methyl-2-phenylvaleric acid 1-methyl-4-piperidyl ester fumarate;an intestinal antispasmodic. (05 Mar 2000) |
| pentapiperium methylsulfate | 4-Hydroxy-1,1-dimethylpiperidinium methyl sulfate 3-methyl-2-phenylvalerate;an anticholinergic agent. (05 Mar 2000) |
| Pendred's syndrome |
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| penetrability |
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| pentoxifylline |
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| penumbra |
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| penicilliary |
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| PEN | a small pennant borne on a lance |
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| PEN | a small pennant borne on a lance |
| PEN | a Mid-Atlantic state |
| PEN | one of the British colonies that formed the United States |
| PEN | a dialect of High German spoken in parts of Pennsylvania and Maryland |
| PEN | a resident of Pennsylvania |
| PEN | from 280 million to 310 million years ago |
| PEN | from 280 million to 310 million years ago |
| PEN | a coin worth one-hundredth of the value of the basic unit |
| PEN | a fractional monetary unit of Ireland and the United Kingdom |
| PEN | priced at 1 cent |
| PEN | (used in combination) priced as indicated |