/ Dictionary / Index N noninvasive: Meaning and Definition of Find definitions for: non•in•va•sive Pronunciation: (non"in-vā'siv), [key] — adj. Med. not invading adjacent healthy cells, blood vessels, or tissues; localized: a noninvasive tumor. not entering or penetrating the body or disturbing body tissue, esp. in a diagnostic procedure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: noninvasive (Thesaurus) nonintervention nonionic detergent Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language