Angler \An"gler\, n. 1. One who angles. 2. (Zo["o]l.) A fish ({Lophius piscatorius}), of Europe and America, having a large, broad, and depressed head, with the mouth very large. Peculiar appendages on the head are said to be used to entice fishes within reach. Called also {fishing frog}, {frogfish}, {toadfish}, {goosefish}, {allmouth}, {monkfish}, etc.