| prase | <chemical> A variety of cryptocrystalline of a leek-green colour. Origin: L. Prasius, fr. Gr. Of a leek-green, fr. Gr. A leek: cf. F. Prase. Source: Websters Dictionary (01 Mar 1998) |
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| praseodymium | <chemistry, element> An elementary substance, one of the constituents of didymium; so called from the green colour of its salts. Atomic weight: 143.6 Abbreviation: Ps Source: Websters Dictionary (01 Mar 1998) |
| praseolite | <chemical> A variety of altered iolite of a green colour and greasy luster. (30 Mar 1998) |
| prasoid | <chemical> Resembling prase. Origin: Gr. Leek. Source: Websters Dictionary (01 Mar 1998) |
| prasterone | <chemical> (3 beta)-3-hydroxyandrost-5-en-17-one. A naturally occurring androgen isolated from urine. Chemical name: Androst-5-en-17-one, 3-hydroxy-, (3beta)- (12 Dec 1998) |