D defs.my
Entry 2 senses Webster, 1913

Uncia

· Un·ci·a · IPA /ˈʌnʃi.ə/
01 n. A twelfth part, as of the Roman as; an ounce.
pl. Unciae ((#))
  1. 1.
    A twelfth part, as of the Roman as; an ounce.(Rom. Antiq.)
  2. 2.
    A numerical coefficient in any particular case of the binomial theorem.(Alg.) [Obs.]