Webster's Revised Unabridged Dictionary · 1913

Denier

Denier , noun

One who denies; as, a denier of a fact, or of the faith, or of Christ.

Denier , noun

[French denier, from Latin denarius a Roman silver coin orig. equiv. to ten asses, later, a copper, from deni ten by ten, from the root of decem ten; akin to English ten. See Ten, and compare Denary, Dinar.]

A small copper coin of insignificant value.
My dukedom to a beggarly denier. — Shakespeare