/ Dictionary / Index A antineoplastic: Meaning and Definition of Find definitions for: an•ti•ne•o•plas•tic Pronunciation: (an"tē-nē"ō-plas'tik, an"tī-), [key] — Med., Pharm. Med.,Pharm. —adj. destroying, inhibiting, or preventing the growth or spread of neoplasms. —n. an antineoplastic substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: antineoplastic (Thesaurus) antimutagenic antineutrino Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language