cologarithm

cologarithm

[koh-law-guh-rith-uhm, -rith-uhm, -log-uh-]
noun Mathematics.
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:
1880–85; co- + logarithm

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World English Dictionary
cologarithm (kəʊˈlɒɡəˌrɪðəm)
 
n
colog the logarithm of the reciprocal of a number; the negative value of the logarithm: the cologarithm of 4 is log 1⁄4

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