proboscis

From ZooTerms (Dictionary of Invertebrate Zoology)
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proboscis (noun; plural proboscises; Greek proboskis, trunk): 1. Any extended trunk or beaklike sucking mouth parts of numerous invertebrates, as of leeches, planarians, dipteran insects, nemertine worms, acanthacephalans, annelids and mollusks.

2. (Echiura) Muscular food gathering and respiratory organ extending from the trunk near the mouth.