/ Dictionary / Index C cologarithm: Meaning and Definition of Find definitions for: co•log•a•rithm Pronunciation: (kō-lô'gu-ri"um, -rith"um, -log'u-), [key] — n. Math. the logarithm of the reciprocal of a number, often used in expressing the logarithm of a fraction: log = log 7 + colog 25. Symbol: colog Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. colog cologne Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language