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Noun: retarder  ri'taa(r)-du(r)
  1. Any agent that retards, delays or hinders
    - retardant, retardent, retardation
  2. Any of various devices, as a helix of flat metal strip, introduced into a boiler tube to increase the heating effect of the fire

Derived forms: retarders

Type of: agent

Encyclopedia: Retarder