/ Dictionary / Index P pineal: Meaning and Definition of Find definitions for: pin•e•al Pronunciation: (pin'ē-ul, pī'nē-, pī-nē'-), [key] — adj. resembling a pine cone in shape. of or pertaining to the pineal body. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pineal (Thesaurus) pine pineal apparatus Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language