crown glass
英
美
- crown n.王冠；王权；花冠；顶点；齿冠；克朗（丹麦、瑞典、捷克等国的货币单位）vt.加冕；使...成王；居...之顶；镶齿冠；使圆满；打…的头部
- glass n.玻璃；玻璃杯；玻璃制品vt.镶玻璃（复）glasses:眼镜.
Noun:
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a glass blown into a globe which is later flattened and spun to form a disk
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optical glass of low dispersion and low refractive index
