antoninianus

[ an-tuh-nin-ee-ey-nuh s ]
/ ˌæn təˌnɪn iˈeɪ nəs /

noun, plural an·to·nin·i·a·ni [an-tuh-nin-ee-ey-nahy] /ˌæn təˌnɪn iˈeɪ naɪ/.

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