n. 1 the act or an instance of sucking. 2 a the production of a partial vacuum by the removal of air etc. in order to force in liquid etc. or procure adhesion. b the force produced by this process (suction keeps the lid on). suction-pump a pump for drawing liquid through a pipe into a chamber emptied by a piston.
[ LL suctio f. L sugere suct- SUCK ]