a. 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'::�b3:�b'3.
a. [数]立方之平方根的,二分之三次方的