/ Dictionary / Index E extinctive: Meaning and Definition of Find definitions for: ex•tinc•tive Pronunciation: (ik-stingk'tiv), [key] — adj. tending or serving to extinguish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. extinction extine Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language