DIOPTRAL
- pertaining to diopter (a measure of refractive power, also DIOPTRE) [adj]
- unit of measure of the refractive power of a lens, having the dimension of the reciprocal of length and a unit equal to the reciprocal of one meter
- instrument, invented by Hipparchus, to measure the apparent diameter of the sun or moon or to estimate the size or elevation of distant objects
- DIOPTER, a measure of refractive power [adj]
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