noun, plural prostomia [proh-stoh-mee-uh] .
the unsegmented, preoral portion of the head of certain lower invertebrates.

1865–70; < Neo-Latin < Greek prostómion mouth. See pro-2, stoma, -ium

prostomial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prostomium (prəʊˈstəʊmɪəm)
n , pl -mia
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]

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