Pronunciation: (kum-bus'tu-bul), [key]
1. capable of catching fire and burning; inflammable; flammable: Gasoline vapor is highly combustible.
2. easily excited: a high-strung, combustible nature.
a combustible substance: Trucks carrying combustibles will not be allowed to use this tunnel.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.