[1] : The Collaborative International Dictionary of English v.0.48

peristalsis \per`istal"sis\, n. nl. see peristaltic.
   physiol.
   peristaltic contraction or action.
   1913 webster
see also:
peristaltic 

[2] : WordNet (r) 2.0

peristalsis
     n : the process of wave-like muscle contractions of the
         alimentary tract that moves food along syn: vermiculation
         ant: anastalsis
     also: peristalses pl
see also:
vermiculation anastalsis peristalses 

Peristalsis >> P Words
Peristalsis, definition of term: Peristalsis
peristalsis_pag1.html