Retarder

Re*tard"er

(?), n. 1. One who, or that which, retards.
[1913 Webster]

2. (Steam Boiler) Any of various devices, as a helix of flat metal strip, introduced into a boiler tube to increase the heating effect of the fire.
[Webster 1913 Suppl.]

3. (Photog.) A substance, as potassium bromide, added to a developer to retard its action.
[Webster 1913 Suppl.]

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Sun 17th February 2019