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

Derived Forms

• proˈstomial, adjective

Other Words From

• pro·stomi·al adjective

Word History and Origins

Origin of prostomium¹

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

Word History and Origins

Origin of prostomium¹

via New Latin from Greek prostomion mouth

Example Sentences

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg