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Noun: reducer  ri'd(y)oo-su(r)
  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
    - reducing agent, reductant
  2. Pipefitting that joins two pipes of different diameter

Derived forms: reducers

Type of: chemical agent, pipe fitting, pipefitting

Encyclopedia: Reducer