astigmatism

English

Etymology

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

Pronunciation

  • (US) IPA(key): /əˈstɪɡmətɪzm̩/
  • Audio (US):(file)

Noun

astigmatism (countable and uncountable, plural astigmatisms)

  1. (optics) A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.
  2. (pathology) A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.

Synonyms

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Further reading

Romanian

Etymology

Borrowed from French astigmatisme. By surface analysis, astigmat +‎ -ism.

Noun

astigmatism n (uncountable)

  1. astigmatism

Declension

Declension of astigmatism
singular only indefinite definite
nominative-accusative astigmatism astigmatismul
genitive-dative astigmatism astigmatismului
vocative astigmatismule

Swedish

Noun

astigmatism c

  1. (optics) astigmatism
  2. (pathology) astigmatism

Declension

Declension of astigmatism
nominative genitive
singular indefinite astigmatism astigmatisms
definite astigmatismen astigmatismens
plural indefinite — —
definite — —

See also

References

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