/ Dictionary / Index C ceria: Meaning and Definition of Find definitions for: ce•ri•a Pronunciation: (sēr'ē-u), [key] — n. a white-to-yellow, heavy powder, cerium dioxide, CeO, usually derived from cerium nitrate by decomposition with heat: used chiefly in ceramics, glass polishing, and decolorizing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Cerf ceric Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language