Also called a reducing agent. A substance that causes another substance to be reduced by donating one or more electrons to it (compare with oxidant).
The term "reductant" was found in the following pages:
Instrument database: Analytik Jena AG - Mercur - Atomic fluorescence spectrometer for mercury determination
Instrument database: Analytik Jena AG - mercur – Combined AAS/AFS spectrometer for mercury determination