Meaning of antoninianus

an•to•nin•i•a•nus

Pronunciation: (an"tu-nin"ē-ā'nus), [key]
— pl. -ni
  1. a Roman coin of the 3rd century a.d., originally of silver but later debased.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.