/ Dictionary / Index C Christmas factor: Meaning and Definition of Find definitions for: Christ'mas fac"tor Pronunciation: [key] — Biochem. Biochem. a blood constituent necessary for clotting, the absence of which is characterized by a hemophilialike condition. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Christmas Eve Christmas fern Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language