antispast

from The Collaborative International Dictionary of English v.0.48

Antispast \An"ti*spast\, n. [L. antispastus, Gr. ?, fr. ? to
   draw the contrary way; 'anti` against + ? to draw.] (Pros.)
   A foot of four syllables, the first and fourth short, and the
   second and third long (#).
   [1913 Webster]