Word Study
sesquiplicate
CIDE DICTIONARY
sesquiplicate, a. [Sesqui- + plicate.].
Subduplicate of the triplicate; -- a term applied to ratios; thus, a and a′ are in the sesquiplicate ratio of b and b′, when a is to a′ as the square root of the cube of b is to the square root of the cube of b′, or a:a′::3:3 . [1913 Webster]
"The periodic times of the planets are in the sesquiplicate ratio of their mean distances." [1913 Webster]
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