prostomial

prostomium

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

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

prostomial, adjective
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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]
 
pro'stomial
 
adj

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