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单词 crown glass
释义

WordReference Random House Unabridged Dictionary of American English © 2024
crown glass′, 
    1. Optics, Ceramicsan optical glass of low dispersion and generally low index of refraction.
    2. Ceramicsan old form of window glass formed by blowing a globe and whirling it into a disk.
    • 1700–10

Collins Concise English Dictionary © HarperCollins Publishers::
crown glass n
  1. another name for optical crown
  2. an old form of window glass made by blowing a globe and spinning it until it formed a flat disc
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