crown glass

Noun
  1. A glass blown into a globe which is later flattened and spun to form a disk (synset 114904708)
    is a type of: glass - a brittle transparent solid with irregular atomic structure
  2. Optical glass of low dispersion and low refractive index (synset 114904424)
    is a type of: optical glass - clear homogeneous glass of known refractive index; used to make lenses
    same as: optical crown, optical crown glass

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