/ Dictionary / Index O olfactory bulb: Meaning and Definition of Find definitions for: olfac'tory bulb" Pronunciation: [key] — Anat. Anat. the enlarged terminal part of each olfactory lobe from which the olfactory nerve originates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. olfactory olfactory lobe Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language