/ Dictionary / Index P proboscis: Meaning and Definition of Find definitions for: pro•bos•cis Pronunciation: (prō-bos'is, -kis), [key] — pl. -bos•cis•es, -bos•ci•des the trunk of an elephant. any long flexible snout, as of the tapir. Also calledthe elongate, protruding mouth parts of certain insects, adapted for sucking or piercing. any of various elongate feeding, defensive, or sensory organs of the oral region, as in certain leeches and worms. the human nose, esp. when unusually long or prominent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: proboscis (Thesaurus) proboscidean proboscis monkey Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language