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]