Bible Dictionaries
Retarder

Webster's Dictionary

(1):

(n.) 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):

(n.) A substance, as potassium bromide, added to a developer to retard its action.

(3):

(n.) One who, or that which, retards.

Bibliography Information
Webster, Noah. Entry for 'Retarder'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​r/retarder.html. 1828.