/ Dictionary / Index I inoculum: Meaning and Definition of Find definitions for: in•oc•u•lum Pronunciation: (i-nok'yu-lum), [key] — pl. -la the substance used to make an inoculation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: inoculum (Thesaurus) inoculation inodorous Related Content Daily Word Quiz: feral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language