optical crown, crown glass, optical crown glass(noun)
optical glass of low dispersion and low refractive index
The numerical value of optical crown in Chaldean Numerology is: 5
The numerical value of optical crown in Pythagorean Numerology is: 5
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"optical crown." Definitions.net. STANDS4 LLC, 2017. Web. 17 Dec. 2017. <http://www.definitions.net/definition/optical crown>.