Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The portion of the head in earthworms and other annelids that is situated anterior to the mouth.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. That portion of the head of an annelid situated in front of the mouth.

from the GNU version of the Collaborative International Dictionary of English

  • n. That portion of the head of an annelid situated in front of the mouth.

from The Century Dictionary and Cyclopedia

  • n. The region in front of the mouth in the embryos of the C┼ôlomata; the preorsd part of the head: said chiefly of invertebrates, as mollusks and worms.

Etymologies

New Latin, from Greek prostomion, mouth, lips : pro-, in front of; see pro-2 + stoma, mouth.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek, meaning "before the mouth". (Wiktionary)

Examples

  • There is a small protruding lip just over the mouth, called prostomium.

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