- an eye of a horse affected with moon blindness.
- any silvery, herringlike fish of the family Hiodontidae, especially Hiodon tergisus, found in fresh waters from Hudson Bay to the lower Mississippi, having large eyes.
- any of several North American large-eyed freshwater clupeoid fishes of the family Hiodontidae, esp Hiodon tergisus
- vet science another name for moon blindness (def. 2)
