The Collaborative International Dictionary of English v.0.48:

Decistere \Dec"i*stere\, n. [F. d['e]cist[`e]re; pref. d['e]ci-
   tenth (fr. L. decimus) + st[`e]re a stere.] (Metric System)
   The tenth part of the stere or cubic meter, equal to 3.531
   cubic feet. See Stere.
   [1913 Webster]