The Collaborative International Dictionary of English v.0.48:

Hydride \Hy"dride\, n. [Hydr- + ide.] (Chem.)
   A compound of the binary type, in which hydrogen is united
   with some other element.

   lith"i*um hy"dride, n. (Chem.) A hydride of lithium, LiH,
      commonly used as a powerful reducing agent in organic
      chemistry.
      [PJC]