dehydroretinaldehyde

[dē-hī′drō-rĕt′n-ăldə-hīd′]
n.
  1. An orange-red crystalline aldehyde that is a derivative of vitamin A and acts in the retina to form the visual pigments of the rods and cones.retinene2
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.