The Collaborative International Dictionary of English v.0.48:

Conistra \Co*nis"tra\, n. [NL., fr. Gr. ?, fr. ? dust.] (Greek
   Antiq.)
   Originally, a part of the palestra, or gymnasium among the
   Greeks; either the place where sand was stored for use in
   sprinkling the wrestlers, or the wrestling ground itself.
   Hence, a part of the orchestra of the Greek theater.
   [1913 Webster]