Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A form of colorblindness characterized by insensitivity to green.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A form of color blindness. Involves a defect in distinguishing between red and green.

from The Century Dictionary and Cyclopedia

  • n. In psychophysics, a form of red-green colorblindness; the so-called green-blindness.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red

Etymologies

deuter(o)- + Greek anōpiā, blindness (an-, not; see a-1 + -ōpiā, -opia), so called because green is considered the second of the primary colors.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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