| Definitions | | dioptrical |
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adjective
- (obsolete) Pertaining to a diopter.
- Acting as a medium for sight; making use of refraction (of lenses etc.).
- (obsolete) Capable of being seen through.
- 1759: had the said glass been there set up, nothing more would have been wanting, in order to have taken a man's character, but to have taken a chair and gone softly, as you would to a bee-hive, and look'd in " Laurence Sterne, The Life & Opinions of Tristram Shandy, Gentleman (Penguin 2003, p. 65)
Etymology: Variant of dioptric.
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