reducer

Noun
  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 (synset 114804426)
    is a type of: chemical agent - an agent that produces chemical reactions
    subtypes: hydrazine - a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels
    same as: reducing agent, reductant
  2. Pipefitting that joins two pipes of different diameter (synset 104073771)
    is a type of: pipe fitting, pipefitting - fitting consisting of threaded pieces of pipe for joining pipes together

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