/ Dictionary / Index A area opaca: Meaning and Definition of Find definitions for: ar'ea o•pa'ca Pronunciation: (ō-pā'ku), [key] — Embryol. Embryol. the opaque area of the blastoderm surrounding the area pellucida. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. areal velocity area pellucida Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language