astigmia
a·stig·mi·a
AstigmatismAstigmatism
US/əˈstɪɡmiʌ/
Meaning
1 senses(dated, uncountable, usually)Astigmatism
More definitions
- (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
- (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
Origin
From a- (negative prefix) + Ancient Greek στίγμα (stígma, “mark, point”) + -ia.From a- (negative prefix) + Ancient Greek στίγμα (stígma, “mark, point”) + -ia.
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Forms
plural: astigmias| Singular | astigmia |
|---|
uncountable
Synonyms
1 synonymsClose in meaning
- (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point:astigmatism
- (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people:astigmatism
Word family
1 related wordsRelatedastigmatic
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable