off-gas

noun

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\ ˈȯf-ˌgas

plural off-gases also off-gasses

Definition of off-gas

(Entry 1 of 2)

: a gas that is produced as a by-product of an industrial process or that is given off by a manufactured object or material Refinery off-gases from fluid catalytic cracking could be a source of ethylene. — Predicasts Technology Update

off-gas

verb

off-gassed; off-gassing

Definition of off-gas (Entry 2 of 2)

transitive + intransitive

: to give off a typically harmful gas In addition, OSHA intends to amend the hazard communication provisions of the standard to require hazard warning labels for solid materials capable of off-gassing formaldehyde at levels between 0.1 ppm and 0.5 ppm … — Chemical & Engineering News … there have been environmental concerns about the phenol formaldehyde binders used in most engineered-wood products, which can off-gas.— Max Alexander