/ Dictionary / Index P pyroxenite: Meaning and Definition of Find definitions for: py•rox•e•nite Pronunciation: (pī-rok'su-nīt", pu-), [key] — n. Petrol. any rock composed essentially, or in large part, of pyroxene of any kind. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyroxene pyroxylin Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language