Definition of blue-eye

1 : an Australian honeyeater (Entomyzon cyanotis)
2 : a small Australian silversides (Pseudomugil signifer) used locally in mosquito control and widely known as an aquarium fish
3 : a faulty or defective eye of a horse especially : walleye
4 : a disease of Indian corn caused by fungi of the genus Penicillium and characterized by a rotting and darkening of the germ often after harvesting

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