Webster's English Dictionary

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vernier

1. ver.ni.er \'v*r-ne--*r\ n [Pierre Vernier -1637 F mathematician] 1: a 
   short scale made to slide along the divisions of a graduated instrumen t 
   for indicating parts of divisions 2: a small auxiliary device used with a 
   main device to obtain fine adjustme nt
2. vernier aj : having or comprising a vernier