/ Dictionary / Index A anaphylaxis: Meaning and Definition of Find definitions for: an•a•phy•lax•is Pronunciation: (an"u-fu-lak'sis), [key] — n. Pathol. exaggerated allergic reaction to a foreign protein resulting from previous exposure to it. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: anaphylaxis (Thesaurus) anaphylactic shock anaplasia Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language