noun
Meaning 1
astigmatism
Definition source: English Wiktionary via Wiktextract
Usage: dated, uncountable, usually
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Standard Lemma guide
astigmia
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
-
US: /əˈstɪɡmiʌ/
noun
Meaning 2
(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: astigmatism
Antonyms: none provided
Broader terms: condition, status
noun
Meaning 3
(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: astigmatism
Antonyms: none provided
Broader terms: ametropia
Narrower terms: keratectasia, keratoconus
History
Etymology
From a- (negative prefix) + Ancient Greek στίγμα (stígma, “mark, point”) + -ia.