/ Dictionary / Index P penetrative: Meaning and Definition of Find definitions for: pen•e•tra•tive Pronunciation: (pen'i-trā"tiv), [key] — adj. tending to penetrate; piercing. acute; keen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: penetrative (Thesaurus) penetration aid penetrometer Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language