Dictionary.com
definitions
  • synonyms

retarder

[ri-tahr-der]
noun
  1. a person or thing that retards.
  2. Chemistry.
    1. any substance added to rubber to delay or prevent vulcanization.
    2. any substance added to delay a process.
  3. Building Trades. an admixture of concrete or plaster that retards its set.
Show More

Origin of retarder

First recorded in 1635–45; retard + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for retarder

retarder

noun
  1. a person or thing that retards
  2. a substance added to slow down the rate of a chemical change, such as one added to cement to delay its setting
Show More
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for retarder

n.

1640s, agent noun from retard (v.). Of railway braking mechanisms from 1937.

Show More
Online Etymology Dictionary, © 2010 Douglas Harper