Flint-glass



noun, Optics.
1.
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.
noun
1.
another name for optical flint, flint (sense 4)

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    [flin-tee] /ˈflɪn ti/ adjective, flintier, flintiest. 1. composed of, containing, or resembling , especially in hardness. 2. unyielding; unmerciful; obdurate: a flinty heart. /ˈflɪntɪ/ adjective flintier, flintiest 1. of, relating to, or resembling flint 2. hard or cruel; obdurate; unyielding adj. “hard-hearted,” 1530s, from flint + -y (2). Literal sense of “resembling flint” is from […]



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    [flint] /flɪnt/ noun 1. a hard stone, a form of silica resembling chalcedony but more opaque, less pure, and less lustrous. 2. a piece of this, especially as used for striking fire. 3. a chunk of this used as a primitive tool or as the core from which such a tool was struck. 4. something […]

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