Webster's Online Dictionary
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Definition: DIOPTRY

Part of Speech Definition
Noun 1. A dioptre.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Dioptry" was first used in popular English literature: sometime before 1914. (references)

Definition: DIOPTRY

Part of SpeechDefinition
Noun1. A dioptre.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "DIOPTRY" was first used in popular English literature: sometime before 1914. (references)