combustible

UK: /kəmˈbʌstɪb^əl/ US: /kəmˈbʌstəbəl/ ,(kəm bus′tə bəl)

WordReference Random House Learner's Dictionary of American English © 2026

com•bus•ti•ble /kəmˈbʌstəbəl/   adj. 

1. Physics capable of catching fire and burning; flammable:
   combustible materials.
2. easily excited:
   a combustible temper.

n. [countable]

3. Physics a combustible substance.

com•bus•ti•bil•i•ty /kəmˌbʌstəˈbɪlɪti/  n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2026

com•bus•ti•ble  (kəm bus′tə bəl), adj. 

1. Physics capable of catching fire and burning;
   inflammable;
   flammable:
   Gasoline vapor is highly combustible.
2. easily excited:
   a high-strung, combustible nature.

n. 

3. Physics a combustible substance:
   Trucks carrying combustibles will not be allowed to use this tunnel.

• Late Latin combūstibilis. See combust, -ible
• 1520–30

com•bus′ti•bil′i•ty, com•bus′ti•ble•ness, n. 
com•bus′ti•bly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::

combustible / kəmˈbʌstəb^əl/ adjective

1. capable of igniting and burning
2. easily annoyed; excitable

noun

1. a combustible substance

comˌbustiˈbility, comˈbustibleness noun