| 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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| TAB vaccine | A suspension of killed typhoid and paratyphoid A and B bacilli. See: typhoid vaccine. Synonym: TAB vaccine. (05 Mar 2000) |