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prostomium

[ proh-stoh-mee-uhm ]

noun

, plural pro·sto·mi·a [proh-, stoh, -mee-, uh].
  1. the unsegmented, preoral portion of the head of certain lower invertebrates.


prostomium

/ prəʊˈstəʊmɪəm /

noun

  1. the lobe at the head end of earthworms and other annelids: bears tentacles, palps, etc, or forms part of a sucker or proboscis
“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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Derived Forms

  • proˈstomial, adjective
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Other Words From

  • pro·stomi·al adjective
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Word History and Origins

Origin of prostomium1

1865–70; < New Latin < Greek prostómion mouth. See pro- 2, stoma, -ium
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Word History and Origins

Origin of prostomium1

via New Latin from Greek prostomion mouth
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Example Sentences

Prostomium wider than long, deeply bilobed, the median tentacle inserted deeply in the intervening incision.

Prostomium shortly subcordate, well rounded in front, incurved caudally.

Prostomium generally small, sometimes prolonged, but never bearing tentacles or processes.

Prostomium: The region in front of the mouth; the preoral part of the head.

Prostomium of usual general form; consisting of fourteen or fifteen rings.

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