combustible
Americanadjective
-
capable of catching fire and burning; inflammable; flammable.
Gasoline vapor is highly combustible.
-
easily excited.
a high-strung, combustible nature.
noun
adjective
-
capable of igniting and burning
-
easily annoyed; excitable
noun
Other Word Forms
- combustibility noun
- combustibleness noun
- combustibly adverb
- uncombustible adjective
Etymology
Origin of combustible
From the Late Latin word combūstibilis, dating back to 1520–30. See combust, -ible
Explanation
Combustible means "able to catch fire," like matches or the extremely dry forest floors that people sometimes forget are combustible — until they go up in flames. When the adjective combustible first entered the English language in the sixteenth century, it was used to describe things that burn easily. The word soon came to apply not only to objects that ignite but also to tempers that are prone to "catch fire" easily. If you’ve ever been around a person who has a combustible temper, you can understand the connection.
Vocabulary lists containing combustible
Automobiles
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100 Great Words from "Fahrenheit 451" -- Part I Vocabulary
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The Great Fire
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The mood out in one of the world's most important waterways is combustible.
From BBC • Apr. 22, 2026
On Tuesday, the Mets lost when combustible relief pitcher Devin Williams fell apart again, allowing Minnesota a go-ahead run and walking in a fifth run for kicks.
From The Wall Street Journal • Apr. 22, 2026
Evidence presented at hearings last week showed that government departments failed to effectively address residents' complaints about construction workers smoking on site and the use of combustible building materials during renovations.
From Barron's • Mar. 24, 2026
"The reality is that the scale of risk inside this building in terms of its combustible nature, its complex layout, ageing systems, and possible places where a fire could start is incredible."
From BBC • Mar. 6, 2026
On the day the fire started, over 55 miles of pine- block streets and 600 miles of wooden sidewalks bound the 23,000 acres of the city in a highly combustible knot.
From "The Great Fire" by Jim Murphy
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
