reducer

Definitions of reducer
  1. 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
    synonyms: reducing agent, reductant
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    types:
    hydrazine
    a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels
    type of:
    chemical agent
    an agent that produces chemical reactions
  2. noun
    pipefitting that joins two pipes of different diameter
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    type of:
    pipe fitting, pipefitting
    fitting consisting of threaded pieces of pipe for joining pipes together
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