Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A system consisting of a concave spherical mirror and a transparent plate of glass at its center of curvature, used in reflecting telescopes to offset spherical aberration and coma.

Etymologies

After Bernhard Voldemar Schmidt (1879-1935), Estonian-born German optical scientist.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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