WordReference Random House Unabridged Dictionary of American English © 2025
pro•ta•no•pi•a
(prōt′n ō′pē ə),USA pronunciation n. [Ophthalm.]
pro•ta•nop•ic
(prōt′n op′ik),USA pronunciation adj.
- Ophthalmologya defect of vision in which the retina fails to respond to red or green.
- Neo-Latin; see prot-, an-1, -opia
- 1900–05;