Definition of "dichromatic" []

• Possessing or exhibiting two colors. (adjective)
• Zoology Having two distinct color phases not associated with season, sex, or age, as do certain species of birds. (adjective)
• Pathology Of or relating to dichromatism. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "All the males of most species, and many of the females, are dichromatic, meaning they only have two kinds of cone cells."
• "Nikon D300, 600 mm lens, 1.4 extender, ISO 640, f/13, 1/640 sec Question: This dichromatic Ethiopian mystery bird is a very rare vagrant to western Europe."
• "This species is strongly dichromatic, meaning that the males and females have distinctive plumage colours and patterns -- a characteristic that distinguishes it from the monochromatic Cyprus pied wheatear, Oenanthe cypriaca, with which it was formerly considered to be conspecific."