Webster's English Dictionary

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suction

suc.tion \'s*k-sh*n\ n [LL suction-, suctio, fr. L suctus, pp. of sugere to 
   su]ck - more at SUCK 1: the act or process of sucking  2a: the act or 
   process of exerting a force upon a solid, liquid, or gaseous  body by 
   reason of reduced air pressure over part of its surface 2b: force so 
   exerted  3: a device (as a pipe or fitting) used in a machine that operates 
   by sucti on