/ Dictionary / Index A amygdaloid: Meaning and Definition of Find definitions for: a•myg•da•loid Pronunciation: (u-mig'du-loid"), [key] — n. Petrol. a volcanic rock in which rounded cavities formed by the expansion of gas or steam have later become filled with deposits of various minerals. —adj. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: amygdaloid (Thesaurus) amygdaline amygdule Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language