COMPOUND Numbers, those which may be divided by some other number besides unity without a remainder; such as 18 and 20, the first being measured by 2, 6, 9, and the second by 2, 4, 5, 10.
COMPOUND Ratio is that which the product of the antecedents of two or more ratios has to the product of their consequents. Thus 6 to 72 is in a ratio compounded of 2 to 6, and of 3 to 12.