| 单词 | flint glass |
| 释义 | flint glass in British Englishnoun another name for optical flint, flint (sense 4) flint glass in American English a hard, bright glass containing lead oxide and having a high index of refraction, used for lenses, crystal, etc. flint glass in American Englishnoun Optics an optical glass of high dispersion and a relatively high index of refraction, composed of alkalis, lead oxide, and silica, with or without other bases, sometimes used as the diverging lens component of an achromatic lens Word origin [1665–75]This word is first recorded in the period 1665–75. Other words that entered Englishat around the same time include: background, group, setback, wader, wig |
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