The word *uncia* was Latin for a unit equal to 1/12 of another unit called the *as.* The words ``inch'' (1/12 of a
foot) and ``ounce'' (originally 1/12 of a pound and still 1/12 of a ``Troy pound,'' now used primarily to weigh precious
metals) are derived from the word *uncia.*

*See also *Calcus, Half, Quarter, Scruple, Unit Fraction

**References**

Conway, J. H. and Guy, R. K. *The Book of Numbers.* New York: Springer-Verlag, p. 4, 1996.

© 1996-9 *Eric W. Weisstein *

1999-05-26