Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
A class of glass used to create optical lenses, such as that for spectacles or spyglasses
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
clear homogeneous glass of known refractive index; used to make lenses
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
Broader terms: glass
Narrower terms: optical crown, crown glass, optical crown glass, optical flint, flint glass
History
From optical + glass from being the type of glass used for optics.
