antoninianus

[an-tuh-nin-ee-ey-nuh s]
noun, plural an·to·nin·i·a·ni [an-tuh-nin-ee-ey-nahy] /ˌæn təˌnɪn iˈeɪ naɪ/.
  1. a Roman coin of the 3rd century a.d., originally of silver but later debased.

Origin of antoninianus

< Latin Antōnīniānus pertaining to Antoninus, equivalent to Antōnīn(us) + -iānus -ian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018