The Collaborative International Dictionary
Subduplicate
Subduplicate \Sub*du"pli*cate\,
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(Math.) Expressed by the square root; -- said of ratios.
Subduplicate ratio, the ratio of the square roots, or the square root of a ratio; thus, the subduplicate ratio of a to b is [root]a to [root]b, or [root]a/
Wiktionary
subduplicate
a. (context mathematics English) Expressed by the square root; said of ratios.