4. A pipe through which anything is drawn.
5. A small piece of leather, usually round, having a string attached to the center, which, when saturated with water and pressed upon a stone or other body having a smooth surface, adheres, by reason of the atmospheric pressure, with such force as to enable a considerable weight to be thus lifted by the string; used by children as a plaything.
7. (Science: zoology) Any one of numerous species of North American fresh water cyprinoid fishes of the family Catostomidae; so called because the lips are protrusile. The flesh is coarse, and they are of little value as food. The most common species of the Eastern united states are the northern sucker (Catostomus Commersoni), the white sucker (C. Teres), the hog sucker (C. Nigricans), and the chub, or sweet sucker (Erimyzon sucetta). Some of the large western species are called buffalo fish, red horse, black horse, and suckerel. The remora.
The hagfish, or myxine.
8. A parasite; a sponger. See def. 6, above. They who constantly converse with men far above their estates shall reap shame and loss thereby; if thou payest nothing, they will count thee a sucker, no branch. (Fuller)
10. A greenhorn; one easily gulled.