Noun
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
Source: WordNetA fundamental redox reaction is "self-exchange", which involves the degenerate reaction between an oxidant and a reductant. Source: Internet
In industry, hydrogen is the preferred reductant, whereas in the laboratory, tin and iron are often employed. Source: Internet
In redox reactions one reactant, the oxidant, lowers its oxidation state and another reactant, the reductant, has its oxidation state increased. Source: Internet
These are linked by plastoquinone, which does require energy to reduce cytochrome f for it is a sufficient reductant. Source: Internet