Source : Webster's Revised Unabridged Dictionary (1913)

Denarius \De*na"ri*us\, n.; pl. {Denarii}. [L. See 2d {Denier}.]
   A Roman silver coin of the value of about fourteen cents; the
   ``penny'' of the New Testament; -- so called from being worth
   originally ten of the pieces called as.

Source : WordNet®

denarii
     See {denarius}