inflammable

This term describes substances that ignite readily, often used in technical, industrial, or safety contexts to warn of fire hazards. It carries a high-alert connotation, signaling immediate danger when exposed to heat or sparks.

Confusion frequently arises between this word and flammable. Despite the prefix in- which usually denotes negation, in this specific case it originates from the Latin inflammare, meaning to set on fire. Consequently, inflammable and flammable are synonyms. To avoid potentially lethal misunderstandings in safety labeling, flammable has become the preferred term in modern regulatory standards.