Dictionary.com

retarder

[ ri-tahr-der ]
/ rɪˈtɑr dər /
Save This Word!
noun
a person or thing that retards.
Chemistry.
  1. any substance added to rubber to delay or prevent vulcanization.
  2. any substance added to delay a process.
Building Trades. an admixture of concrete or plaster that retards its set.
QUIZ
CAN YOU ANSWER THESE COMMON GRAMMAR DEBATES?
There are grammar debates that never die; and the ones highlighted in the questions in this quiz are sure to rile everyone up once again. Do you know how to answer the questions that cause some of the greatest grammar debates?
Question 1 of 7
Which sentence is correct?
His boss, whom he admires, is waiting to meet with him about the big project.
His boss, who he admires, is waiting to meet with him about the big project.
TAKE THE QUIZ TO FIND OUT

Origin of retarder

First recorded in 1635–45; retard + -er1

Words nearby retarder

retardant, retardate, retardation, retarded, retardee, retarder, retarget, retch, retcon, retd., rete
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

British Dictionary definitions for retarder

retarder
/ (rɪˈtɑːdə) /
noun
a person or thing that retards
a substance added to slow down the rate of a chemical change, such as one added to cement to delay its setting
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
FEEDBACK