reducing agent

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re·duc·ing a·gent

(rĕ-dūs'ing ā'jĕnt)
A substance that reduces another substance by donating electrons or a share in its electrons; also called reductant.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

reducing agent

any substance that is capable of removing oxygen from a molecule or of adding hydrogen, i.e. of contributing electrons to a process.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005