Webster's English Dictionary

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denier

1. de.ni.er \di-'ni-(-*)r\ n : one that denies 
2. de.nier \d*-'ni(*)r, d*n-'ya-\ \'den-y*r\ n [ME denere, fr. MF denier, 
   fr. L denarius, coin worth ten ass]es, fr. denarius containing ten, fr. 
   deni ten each, fr. decem ten 1: a small orig. silver coin of France and 
   western Europe from the 8th to t he 19th century 2: a unit of fineness for 
   silk, rayon, or nylon yarn equal to the fineness  of a yarn weighing one 
   gram for each 9000 meters