Illustrated Glossary of Organic Chemistry

Hydride: (1) A hydrogen atom with a negative formal charge, H:- (the hydride ion), or a compound containing this ion.

+Na  :H-
Sodium hydride

Hydride ion (in red) is a leaving group in the Chichibabin reaction.

(2) A molecule with one or more bonds between hydrogen and elements less electronegative than hydrogen (i.e., a molecule that delivers hydride to another molecule).

Common Hydrides

Sodium borohydride
Lithium aluminum hydride
Diisobutylaluminum hydride

Reduction of acetone via hydride (in red) transfer from sodium borohydride.