1.
[syn: reducing agent, reducer, reductant]
The Collaborative International Dictionary of English v.0.48:
Reducing agent \Re*du"cing a`gent\, n. (Chem.)
a substance that causes reduction of another substance in a
chemical reaction, as by donating electrons or adding
hydrogen atoms; as, lithium hydride is a powerful reducing
agent.
[PJC]
WordNet (r) 3.0 (2006):
reducing agent
n 1: a substance capable of bringing about the reduction of
another substance as it itself is oxidized; used in
photography to lessen the density of a negative or print by
oxidizing some of the loose silver [syn: reducing agent,
reducer, reductant]