A foul-smelling outflow or vapor (especially a gaseous waste).

Roget 334: gaseity^†; vaporousness etc. adj.; flatulence, flatulency; volatility; aeration, aerification.    elastic fluid, gas, air, vapor, ether, steam, essence, fume, reek, effluvium, flatus; cloud etc. 353; ammonia, ammoniacal gas^†; volatile alkali; vacuum, partial vacuum.    [Science of elastic fluids] pneumatics, pneumatostatics^†; aerostatics^†, aerodynamics.    gasmeter^†, gasometer^†; air bladder, swimming bladder, sound, (of a fish). ... show more

Roget 398: odor, smell, odorament^†, scent, effluvium; emanation, exhalation; fume, essence, trail, nidor^†, redolence.    sense of smell; scent; act of smelling etc. v.; olfaction, olfactories^†.    [pleasant odor] fragrance etc. 400.    odorant.    [animal with acute sense of smell] bloodhound, hound.    [smell detected by a hound] spoor.    ... show more