cologarithm

[ koh-law-guh-rith-uhm, -rith-uhm, -log-uh- ]

noun

, Mathematics.

1. the logarithm of the reciprocal of a number, often used in expressing the logarithm of a fraction: log 7/25 = log 7 + colog 25. : colog

cologarithm

/ kəʊˈlɒɡəˌrɪðəm /

noun

1. the logarithm of the reciprocal of a number; the negative value of the logarithm colog

   the cologarithm of 4 is log

Word History and Origins

Origin of cologarithm¹

First recorded in 1880–85; co- + logarithm