The Collaborative International Dictionary of English v.0.48:

acrylonitrile \acrylonitrile\ n.
   1. a colorless liquid compound (H2C:CH.CN); used as raw
      material for acrylic fibers, and as a solvent.

   Syn: vinyl cyanide, cyanoethylene, 2-propenenitrile
        [WordNet 1.5 +PJC]