hagfish

noun, plural (especially collectively) hag·fish, (especially referring to two or more kinds or species) hag·fish·es.

1. any eellike, marine cyclostome of the order Myxiniformes, having undeveloped eyes, a barbel-rimmed, circular mouth, and horny teeth for boring into the flesh of fishes to feed on their interior parts.

noun plural -fish or -fishes

1. any eel-like marine cyclostome vertebrate of the family Myxinidae, having a round sucking mouth and feeding on the tissues of other animals and on dead organic materialOften shortened to: hag