What does "diopter" mean?
Diopter: An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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- Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00