sucker

n. 1 a gullible person. B (foll. By for) person susceptible to. 2 a rubber cup etc. Adhering by suction. B similar organ of an organism. 3 shoot springing from a root or stem below ground.

n. One who, or that which, sucks; esp., one of the organs by which certain animals, as the octopus and remora, adhere to other bodies.