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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hemianopia is a noun meaning "blindness in one half of the visual field of one or both eyes". It carries one recorded sense.
blindness in one half of the visual field of one or both eyes
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 hemianopia come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.