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re·tard 1

v. re·tard·ed, re·tard·ing, re·tards
To cause to move or proceed slowly; delay or impede.
To be delayed.
1. A slowing down or hindering of progress; a delay.
2. Music A slackening of tempo.

[Middle English retarden, from Old French retarder, from Latin retardāre : re-, re- + tardāre, to delay (from tardus, slow).]

re·tard′er n.

re·tard 2

n. Offensive Slang
1. Used as a disparaging term for a person with an intellectual disability.
2. A person considered to be foolish or socially inept.

[Short for retarded.]


1. a person or thing that retards
2. (Chemistry) a substance added to slow down the rate of a chemical change, such as one added to cement to delay its setting
References in periodicals archive ?
The SCC mix included grade 57 aggregate, low w/c and four admixtures including a high range water reducer, workability retainer, water reducer and set retarder, as well as an accelerator, to provide high mix workability that is sustained during the discharge and finish of slab, and early strength gain to meet the Florida DOT lane-opening requirement.
Conventional SCC mixes are usually designed using small size aggregates (grade 89 or smaller), and incorporate high range water reducers, set retarders and workability retainers to achieve a very high workability for an extended period of time," they write.