Uncia n. : A twelfth part, as of the Roman as; an ounce.

Uncia n. : A numerical coefficient in any particular case of the binomial theorem.

Example:
Scientifically speaking, how are dogs and cats different?

Taxonomy
Uncia, free encyclopedia, free dictionary, ancient Roman, bronze coin, search, Roman bronze, Roman unit, unit of length, Bolivian, tin mine, genus, the Snow Leopard, cat native, mountain ranges, central Asia, disambiguation pages, Personal tools.

Defination from the web:
Uncia (length), an ancient Roman unit of length. Uncia (mine), a Bolivian tin mine (see Simon Iturri Patino) Uncia, the genus of the Snow Leopard, a large cat native to the mountain ranges of central Asia. This disambiguation page lists articles associated with the same title. ...