reductant

Từ điển WordNet v3.1 - WordNet Dictionary

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
• Syn:
reducing agent, reducer
• Derivationally related forms:
reduce, reduce (for: reducer)
• Hypernyms:
chemical agent
• Hyponyms:
hydrazine