noun, plural (especially collectively) hagfish (especially referring to two or more kinds or species) hagfishes.
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.
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 material Often shortened to hag