- 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. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.