[¦brō·mō·trī¦flu̇r·ō′eth·ə‚lēn] (organic chemistry) BrFC:CF2 A colorless gas with a freezing point of -168°C and a boiling point of -58°C; soluble in chloroform; used as a refrigerant, in hardening of metals, and as a low-toxicity fire extinguisher. Abbreviated BFE.