The Collaborative International Dictionary of English v.0.48:

Anapaest \An`a*p[ae]st\, Anapaestic \An`a*p[ae]s"tic\
   Same as Anapest, Anapestic.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anapaestic
    adj 1: (of a metric foot) characterized by two short syllables
           followed by a long one [syn: anapestic, anapaestic]