astigmatism
English edit
Etymology edit
From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism. Coined by English polymath William Whewell in 1846.
Pronunciation edit
Noun edit
astigmatism (countable and uncountable, plural astigmatisms)
- (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.
- (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 edit
Derived terms edit
Related terms edit
Translations edit
defect of a lens
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disorder of the vision
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See also edit
Further reading edit
- astigmatism on Wikipedia.Wikipedia
Romanian edit
Etymology edit
Borrowed from French astigmatisme. By surface analysis, astigmat + -ism.
Noun edit
astigmatism n (uncountable)
Declension edit
declension of astigmatism (singular only)
singular | ||
---|---|---|
n gender | indefinite articulation | definite articulation |
nominative/accusative | (un) astigmatism | astigmatismul |
genitive/dative | (unui) astigmatism | astigmatismului |
vocative | astigmatismule |