combustible

adjective

com·​bus·​ti·​ble kəm-ˈbə-stə-bəl 

1

: capable of combustion

combustible materials, such as paper, leaves, and sawdust

combustible gases

2

: easily excited

a combustible temper

The coach had to keep the combustible players under control.

combustibility

kəm-ˌbə-stə-ˈbi-lə-tē 

noun

combustible noun

combustibly

kəm-ˈbə-stə-blē 

adverb

Synonyms of combustible

• explosive
• combustive
• flammable
• inflammable
• ignitable
• fiery

Examples of combustible in a Sentence

The fuel is highly combustible.

don't store oily rags and other combustible materials in a hot attic

Recent Examples on the Web

The band’s members were among the first to spy a spark from a circuit breaker that may have set off the blaze that roared across the ceiling, which experts suspect was covered with highly combustible material. — Tian MacLeod Ji, Los Angeles Times, 15 July 2026

The appliance ignited nearby combustible materials, sparking the blaze. — Moná Thomas, PEOPLE, 14 July 2026

Huang Xinyan, a professor at Hong Kong’s Polytechnic University, said footage of the fire site suggests the bar contained combustible foam materials, lacked a sprinkler system and had small exits that may have hampered evacuation. — ABC News, 13 July 2026

The former uses a combustible fuel source that gets accelerated through a nozzle, while the latter uses electrical energy to convert propellant into kinetic energy. — Victor Tangermann, Futurism, 9 July 2026

Word History

Etymology

borrowed from Medieval Latin combustibilis, from Latin combustus (past participle of combūrere "to destroy with fire, combust") + -ibilis -ible

First Known Use

1529, in the meaning defined at sense 1

Rhymes for combustible

• adjustable
• incombustible
• noncombustible

Kids Definition

combustible

adjective

com·​bus·​ti·​ble kəm-ˈbəs-tə-bəl 

1

: capable of being burned

2

: catching fire or burning easily

combustibility

-ˌbəs-tə-ˈbil-ət-ē 

noun

combustible noun

Medical Definition

combustible

adjective

com·​bus·​ti·​ble kəm-ˈbəs-tə-bəl 

: capable of combustion

combustible anesthetics