say it: uh-STIG-muh-tiz-uhm
astigmatism is a noun meaning "(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people". It carries 2 recorded senses.
(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
ophthalmology
(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
optics
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for astigmatism come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.