Origin: Latin suffix -able
Flammable has 3 different meanings across 1 category:
Any flammable substance.
"The safety officer warned everyone that gasoline, alcohol, and propane are all highly flammable substances that require careful storage."
easily ignited
"Keep gasoline away from open flames since it is highly flammable."
Capable of burning, especially a liquid.
"The chemistry teacher warned us to keep the alcohol in its original container because it is highly flammable when exposed to an open flame."