Main Entry: in·com·bus·ti·ble

Pronunciation: \ˌin-kəm-ˈbəs-tə-bəl\

Function: adjective

Etymology: Middle English, probably from Middle French, from in- + combustible combustible

Date: 15th century

: not combustible : incapable of being burned

— in·com·bus·ti·bil·i·ty \-ˌbəs-tə-ˈbi-lə-tē\ noun

— incombustible noun