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bn:00054341n
Noun Concept
Categories: Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, Articles with short description, All articles containing potentially dated statements, Lenses, Optical components
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(optics) a lens that is concave on one side and convex on the other WordNet 3.0
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optics
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(optics) a lens that is concave on one side and convex on the other WordNet 3.0 & Open English WordNet
A lens which is convex on one side and concave on the other, being crescent-shaped in cross-section. Wiktionary
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