The Collaborative International Dictionary of English v.0.48:

Hectostere \Hec"to*stere\, n. [F. hectost[`e]re; Gr. ? hundred +
   F. st[`e]re.]
   A measure of solidity, containing one hundred cubic meters,
   and equivalent to 3531.66 English or 3531.05 United States
   cubic feet.
   [1913 Webster]