ALL meanings of dioptre
di·op·ter
D d - noun dioptre Optics. a 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. Abbreviation: D. 1
- noun dioptre an instrument, invented by Hipparchus, to measure the apparent diameter of the sun or moon or to estimate the size or elevation of distant objects. 1
- noun dioptre Alternative spelling of diopter. 1
- noun dioptre a unit for measuring the refractive power of a lens: the reciprocal of the focal length of the lens expressed in metres 0