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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
optical crown
1.
optical crown
(substance)
optical glass of low dispersion and low refractive index
Synonyms
crown glass
,
optical crown glass
Broader (hypernym)
optical glass
Based on WordNet 3.0 copyright © Princeton University.
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. English edition:
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.
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