den·ier 2 
(d
ən-y
ā)
n.1. (also dĕnyər) A unit of fineness for rayon, nylon, and silk fibers, based on a standard mass per length of 1 gram per 9,000 meters of yarn.
2. (also də-nîr) A small coin of varying composition and value current in western Europe from the eighth century until the French Revolution.
[Middle English denere, a coin, from Old French dener, from Latin dēnārius; see DENARIUS.]