Flame-retardant

adj.resilient, capableprofessional

What it means

Treated or made to resist catching fire.

Reach for it when describing material treated or made to slow ignition or flame spread

Flame-retardant curtains improve safety in the busy theater.

everyday
fire-retardant
the applicable terminology uses fire rather than flame
not when Fire-retardant still means delay, not immunity.
warm
treated
a protective treatment is the only verified fact
not when Treated is too vague unless the treatment and result are named.
professional
fire-resistant
an assembly withstands fire for a rated period
not when A resistant assembly is not interchangeable with treated fabric.
professional
flame-resistant
a tested material resists ignition or spread
not when Resistance and retardancy can refer to different test properties.
professional
self-extinguishing
burning stops after the ignition source is removed
not when Self-extinguishing says nothing about smoke or heat release.

flame-retardant fabric
The theater installed flame-retardant fabric around the stage.
flame-retardant treatment
The label identifies the flame-retardant treatment used.
flame-retardant material
Inspectors sampled the flame-retardant material after renovation.

Fire-safety terms depend on test method and jurisdiction; do not imply that flame-retardant material cannot burn.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.