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Adjective: rancid  ran-sid
  1. (used of decomposing oils or fats) having a rank smell or taste usually due to a chemical change or decomposition
    "rancid butter"; "rancid bacon"
  2. Smelling of fermentation or staleness
    - sour

See also: ill-smelling, malodorous, malodourous [Brit, Cdn, non-standard], minging [Brit, informal], pongy [Brit, informal], stale, stinky [informal], unpleasant-smelling, whiffy [Brit, informal]

Encyclopedia: Rancid