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protanomaly

[proht-n-om-uh-lee]
noun Ophthalmology.
  1. a defect of vision characterized by a diminished response of the retina to red.
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Origin of protanomaly

First recorded in 1935–40; prot- + anomaly
Related formsprot·a·nom·a·lous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018