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Webster 1913 Edition

Adj.

(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 ∛a to ∛b, or ∛

a/b

Adj.

In the ratio of the cubes.

subtriplicate ‎(not comparable)

(mathematics) Expressed by the cube root; said especially of ratios.
The subtriplicate ratio of a to b is ∛a to ∛b.