/ Dictionary / Index D dec-: Meaning and Definition of Find definitions for: dec- Pronunciation: [key] var. ofbefore a vowel: decathlon. Dec. Pronunciation: [key] December. dec. Pronunciation: [key] (in prescriptions) pour off. deceased. decimeter. declension. decrease. decrescendo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dec- (Thesaurus) debye deca- Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language