/ Dictionary / Index A aequorin: Meaning and Definition of Find definitions for: ae•quor•in Pronunciation: (ē-kwôr'in, ē-kwor'-), [key] — n. Biochem., Histol. a protein, secreted by certain jellyfish, that produces a blue light upon binding with calcium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. aequo animo* aer- Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language