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cologarithm

[koh-law-guh-rith-uh m, -rith-uh m, -log-uh-] /koʊˈlɔ gəˌrɪð əm, -ˌrɪθ əm, -ˈlɒg ə-/
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. Symbol: colog.
Origin
1880-1885
1880-85; co- + logarithm
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cologarithm

cologarithm

/kəʊˈlɒɡəˌrɪðəm/
noun
1.
the logarithm of the reciprocal of a number; the negative value of the logarithm the cologarithm of 4 is log 1/4, colog
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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