n.
A hereditary degenerative disease of the retina, characterized by night blindness, pigmentary changes within the retina, and eventual loss of vision.
[New Latin pigmentōsa, feminine of pigmentōsus, pigmented.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
