rem·o·ra (rěm'ər-ə) n. Any of several marine fishes of the family Echeneidae, having on the head a sucking disk with which they attach themselves to sharks, whales, sea turtles, or the hulls of ships. Also called shark sucker, suckerfish, suckfish.
[Latin, delay (from the belief that they could slow ships down), from remorārī, to delay : re-, re- + morārī, to delay (from mora, delay).]