verb def·la·grate \ˈdef-lə-ˌgrāt\

Definition of deflagrate




  1. transitive verb
  2. :  to cause to deflagrate — compare detonate 1

  3. intransitive verb
  4. :  to burn rapidly with intense heat and sparks being given off


play \ˌdef-lə-ˈgrā-shən\ noun

deflagrate was our Word of the Day on 02/16/2015. Hear the podcast!

Did You Know?

Deflagrate combines the Latin verb flagrare, meaning "to burn," with the Latin prefix de-, meaning "down" or "away." Flagrare is also an ancestor of such words as conflagration and flagrant and is distantly related to fulgent and flame. In the field of explosives, deflagrate is used to describe the burning of fuel accelerated by the expansion of gasses under the pressure of containment, which causes the containing vessel to break apart. In comparison, the term detonate (from the Latin tonare, meaning "to thunder") refers to an instant, violent explosion that results when shock waves pass through molecules and displace them at supersonic speed. Deflagrate has been making sparks in English since about 1727, and detonate burst onto the scene a couple of years later.

Origin and Etymology of deflagrate

Latin deflagratus, past participle of deflagrare to burn down, from de- + flagrare to burn — more at black

First Known Use: circa 1727

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to cast off or become cast off

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