pro·sto·mi·um (pr -st m - m)n. pl. pro·sto·mi·a (-m -) The portion of the head in earthworms and other annelids that is situated anterior to the mouth. [New Latin, from Greek prostomion, mouth, lips : pro-, in front of; see pro-2 + stoma, mouth.] pro·sto mi·al (-l) adj. |
prostomium [prəʊˈstəʊmɪəm]
n pl -mia [-mɪə]
(Life Sciences & Allied Applications / Zoology) the lobe at the head end of earthworms and other annelids: bears tentacles, palps, etc., or forms part of a sucker or proboscis
[via New Latin from Greek prostomion mouth]
prostomial adj
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