/ Dictionary / Index A arachidonic acid: Meaning and Definition of Find definitions for: ar'a•chi•don'ic ac'id Pronunciation: (ar'u-ki-don'ik, ar"-), [key] — Biochem. Biochem. an essential fatty acid, CHO, found in the lipids of most tissues, that is a precursor in the synthesis of prostaglandins, prostacyclins, and related effectors. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arachidic acid arachis oil Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language