1. A small tropical fish of the genus Anableps, having eyes divided horizontally to see both above and below the water surface simultaneously.
Usage: zoology; also called four-eyed fish

Examples

• The anableps is a remarkable fish found in Central and South American waters.
• Aquarium enthusiasts sometimes keep anableps for their unusual visual adaptation.
• The anableps can watch for predators above water while feeding below the surface.
• Scientists study the anableps to understand how its divided eyes function.
• The anableps is named for its ability to see in two different environments at once.