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British Dictionary definitions for optical crown

optical crown

noun
  1. an optical glass of low dispersion and relatively low refractive index. It is used in the construction of lenses
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012