/ Dictionary / Index A annihilator: Meaning and Definition of Find definitions for: an•ni•hi•la•tor Pronunciation: (u-nī'u-lā"tur), [key] — n. a person or thing that annihilates. the set of all linear functionals that map to zero all elements of a given subset of a vector space. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: annihilator (Thesaurus) annihilation radiation Anniston Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language