1. Difficult to burn
   - fire-retardant, fire-resisting, fire-resistive

See also: incombustible, noncombustible

Encyclopedia: Fire-resistant

• diffidently
• difflugia
• diffract
• diffraction
• diffraction grating
• diffractive
• diffuse
• diffuse nebula
• diffused
• diffusely
• diffuseness
• diffuser
• diffusible
• diffusing
• diffusing screen
• diffusion
• diffusion pump
• diffusive
• diffusivity
• diffusor
• diflunisal
• dig
• dig in
• dig into
• dig out