ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: hag (I) + fish
: any of several marine cyclostomes (order Hyperotreta) that are related to the lampreys and in general resemble eels but have a round mouth surrounded by eight tentacles, a single nostril opening behind the pharynx, a tongue with horny teeth, and rudimentary eyes and labyrinthine apparatus and that feed upon fishes by boring into their bodies and consuming their viscera and flesh