WordReference Random House Unabridged Dictionary of American English © 2025
prot•a•nom•a•ly
(prōt′n om′ə lē),USA pronunciation n. [Ophthalm.]
prot′a•nom′a•lous, adj.
- Ophthalmologya defect of vision characterized by a diminished response of the retina to red.
- prot- + anomaly 1935–40