Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The anterior portion of the head of an annelid worm, situated in front of the mouth.
from The Century Dictionary.
- noun The region in front of the mouth in the embryos of the Cœlomata; the preorsd part of the head: said chiefly of invertebrates, as mollusks and worms.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Zoöl.) That portion of the head of an annelid situated in front of the mouth.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun zoology That portion of the
head of anannelid situated in front of themouth .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[New Latin, from Greek prostomion, mouth, lips : pro-, in front of; see pro– + stoma, mouth.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
From Ancient Greek, meaning "before the mouth".
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Examples
-
There is a small protruding lip just over the mouth, called prostomium.
unknown title 2009
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