/ Dictionary / Index P pyxidium: Meaning and Definition of Find definitions for: pyx•id•i•um Pronunciation: (pik-sid'ē-um), [key] — pl. pyx•id•i•a a seed vessel that opens transversely, the top part acting as a lid, as in the purslane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pyxidium (Thesaurus) pyx pyxie Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language