The Collaborative International Dictionary
Subtriplicate
Subtriplicate \Sub*trip"li*cate\,
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(Math.) Expressed by the cube root; -- said especially of ratios.
Subtriplicate ratio, the ratio of the cube root; thus, the subtriplicate ratio of a to b is [cuberoot]a to [cuberoot]b, or [cuberoot]a/
Wiktionary
subtriplicate
a. (context mathematics English) Expressed by the cube root; said especially of ratios.