/ Dictionary / Index P protanomaly: Meaning and Definition of Find definitions for: prot•a•nom•a•ly Pronunciation: (prōt"n-om'u-lē), [key] — n. Ophthalm. a defect of vision characterized by a diminished response of the retina to red. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. protamine protanopia Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language