/ Dictionary / Index P pinacoid: Meaning and Definition of Find definitions for: pin•a•coid Pronunciation: (pin'u-koid"), [key] — n. Crystall. a form whose faces are parallel to two of the axes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. piña cloth piña colada Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language