The proboscis of annelids and of mollusks is usually a portion of the pharynx that can be everted or protruded. That of nemerteans is a special long internal organ, not connected with the mouth, and not used in feeding, but capable of being protruded from a pore in the head.
Origin: L. Fr. Gr.; before + to feed, graze.
(19 Mar 1998)
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