/ Dictionary / Index C cyder: Meaning and Definition of Find definitions for: cy•der Pronunciation: (sī'dur), [key] — n. Brit. cider. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cyder (Thesaurus) Cyd Cydnus Related Content Daily Word Quiz: mongrel Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language