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prostomium

 
Dictionary: pro·sto·mi·um   (prō-stō'mē-əm) pronunciation

n., pl., -mi·a (-mē-ə).
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.]

prostomial pro·sto'mi·al (-əl) adj.

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more