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(), n.One who, or that which, retards. Retard"er (rtr"dr), n. 1. (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. 2. (Photog.) A substance, as potassium bromide, added to a developer to retard its action. スポンサード リンク
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