/ Dictionary / Index O osteoclast: Meaning and Definition of Find definitions for: os•te•o•clast Pronunciation: (os'tē-u-klast"), [key] — n. one of the large multinuclear cells in growing bone concerned with the absorption of osseous tissue, as in the formation of canals. an instrument for effecting osteoclasis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: osteoclast (Thesaurus) osteoclasis osteocope Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language