[out-gas, out-gas] Chemistry.
verb (used with object), outgassed, outgassing.
to remove (adsorbed or occluded gases), usually by heat or reduced pressure.
verb (used without object), outgassed, outgassing.
to lose gas.

1920–25; out- + gas

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World English Dictionary
outgas (ˌaʊtˈɡæs)
vb , -gases, -gasses, -gassing, -gassed
to undergo or cause to undergo the removal of adsorbed or absorbed gas from solids, often by heating in free space

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