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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
verboff-gassed; off-gassing
Definition of off-gas (Entry 2 of 2)
: 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
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Merriam-Webster unabridgedWords at Play
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Time Traveler for off-gas
The first known use of off-gas was in 1955
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