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From The Collaborative International Dictionary of English v.0.48:
Peristaltic \Per`i*stal"tic\, a. [Gr. ? clasping and compressing, fr. ? to surround, wrap up; ? round + ? to place, arrange: cf. F. p['e]ristaltique.] (Physiol.) Pertaining to a wormlike wave motion of the intestines, and by analogy, of other flexible tubular structures. In the body it is produced by a progressive contraction of the muscular fibers of their walls, forcing their contents onwards in the direction of the wave; as, peristaltic movement. -- Per`i*stal"tic*al*ly, adv. [1913 Webster]