/ Dictionary / Index O osculum: Meaning and Definition of Find definitions for: os•cu•lum Pronunciation: (os'kyu-lum), [key] — pl. -la a small mouthlike aperture, as of a sponge. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. osculation OSD Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language