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):

anapaest
    n 1: a metrical unit with unstressed-unstressed-stressed
         syllables [syn: anapest, anapaest]