| prostomium | Origin: NL, fr. Gr. Before +, mouth. <zoology> That portion of the head of an annelid situated in front of the mouth. Prosto"mial. Source: Websters Dictionary (01 Mar 1998) |
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| prostrate | Lying flat on the ground. (09 Oct 1997) |
| prostration | Absolute exhaustion. (27 Sep 1997) |