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astigmatism

as·tig·ma·tism

US/əˈstɪɡmətɪzm̩/ uncommon

noun

1.
2.

(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point

Synonyms
Antonyms

Origin

From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism. Coined by English polymath William Whewell in 1846.

Phrases

  • mixed astigmatism

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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.