We found 2 dictionaries that define the word combustible materials:

General (1 matching dictionary)

1. combustible materials: Vocabulary.com

Tech (1 matching dictionary)

2. AUTOMOTIVE TERMS (No longer online)

(Note: See combustible_material as well.)

Definitions from WordNet (combustible material) ▸ noun:  a substance that can be burned to provide heat or power ▸ Also see combustible_material ▸ Words similar to combustible materials ▸ Usage examples for combustible materials ▸ Idioms related to combustible materials ▸ Wikipedia articles (New!) ▸ Words that often appear near combustible materials ▸ Rhymes of combustible materials ▸ Invented words related to combustible materials