re·​tar·​dant | \ ri-ˈtär-dᵊnt \

Definition of retardant

: serving or tending to retard a growth-retardant substance

Keep scrolling for more

Other Words from retardant

retardant noun

Examples of retardant in a Sentence

Recent Examples on the Web

The two-paragraph summary calls for an immediate corrective action, saying firefighters must remain clear of areas with overhead hazards during retardant drops. Fox News, "The Latest: Utah firefighter remembered as sharp leader," 21 Aug. 2018 Men in bright vests rushed to its side, hooked up thick hoses to its retardant compartment, and started pumping. Julia Sclafani And Jordan Cutler-tietjen, sacbee, "Seen those tankers above Sacramento? The low-down on Cal Fire's biggest base at McClellan," 3 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'retardant.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of retardant

1642, in the meaning defined above

Keep scrolling for more

Learn More about retardant

Statistics for retardant

Look-up Popularity

Time Traveler for retardant

The first known use of retardant was in 1642

See more words from the same year

Keep scrolling for more

More Definitions for retardant



English Language Learners Definition of retardant

technical : able to slow down the progress or development of something

More from Merriam-Webster on retardant

Rhyming Dictionary: Words that rhyme with retardant

Britannica English: Translation of retardant for Arabic Speakers

Comments on retardant

What made you want to look up retardant? Please tell us where you read or heard it (including the quote, if possible).


excited commotion or publicity

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!