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[proh-stoh-mee-uh m] /proʊˈstoʊ mi əm/
noun, plural prostomia
[proh-stoh-mee-uh] /proʊˈstoʊ mi ə/ (Show IPA)
the unsegmented, preoral portion of the head of certain lower invertebrates.
Origin of prostomium
1865-70; < New Latin < Greek prostómion mouth. See pro-2, stoma, -ium
Related forms
prostomial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for prostomium


noun (pl) -mia (-mɪə)
the lobe at the head end of earthworms and other annelids: bears tentacles, palps, etc, or forms part of a sucker or proboscis
Derived Forms
prostomial, adjective
Word Origin
via New Latin from Greek prostomion mouth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for prostomium

1870, Latinized form of Greek prostomion "fore-mouth, something before the mouth," from pro "before" (see pro-) + stoma "mouth" (see stoma).

Online Etymology Dictionary, © 2010 Douglas Harper
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