Definition of retinitis pigmentosa
: any of several hereditary progressive degenerative diseases of the eye marked by night blindness in the early stages, atrophy and pigment changes in the retina, constriction of the visual field, and eventual blindness
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Merriam-Webster unabridged
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Time Traveler for retinitis pigmentosa
The first known use of retinitis pigmentosa was in 1859
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