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hemeralopia

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˌhɛmərəˈləʊpɪə/US:USA pronunciation: respellingUSA pronunciation: respelling(hem′ər ə lōpē ə)


WordReference Random House Unabridged Dictionary of American English © 2026
hem•er•a•lo•pi•a  (hem′ər ə lōpē ə),USA pronunciation n. [Ophthalm.]
  1. Ophthalmologya condition of the eyes in which sight is normal in the night or in a dim light but is abnormally poor or wholly absent in the day or in a bright light. Also called day blindness. 
  • Greek hēmeralōp- (stem of hēmerálōps having such a condition (hēmer(a) day +al(aós) blind + -ōps having such an appearance) + -ia -ia; compare -opia
  • Neo-Latin
  • 1700–10;

Collins Concise English Dictionary © HarperCollins Publishers::
hemeralopia /ˌhɛmərəˈləʊpɪə/ n
  1. inability to see clearly in bright lightNontechnical name: day blindness
    Compare nyctalopia
Etymology: 18th Century: New Latin, from Greek hēmeralōps, from hēmera day + alaos blind + ōps eyehemeralopic /ˌhɛmərəˈlɒpɪk/ adj
'hemeralopia' also found in these entries (note: many are not synonyms or translations):

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