What does rancid mean?
Rancid is an adjective most often used to describe food that has spoiled because its fats have broken down, producing an unpleasant smell and taste. Rancid butter, oil, nuts, and other fatty foods can become rancid when exposed to air, heat, or age, so rancidity is a sign that they may be unsafe or unpalatable. The word can also be used figuratively for feelings, attitudes, or remarks that are bitter and hostile, though this usage is less frequent than the culinary sense. In everyday conversation, rancid suggests deterioration and offensiveness rather than simply mild staleness. The term is useful because it names both a recognizable physical condition and the figurative idea of something that has soured over time.
Having an unpleasant smell or taste caused by decomposition, oxidation, or the breakdown of fats, especially in food.
"The butter had become rancid in the warm pantry."
Often used with food or oils; it can also be used figuratively for something bitter or hostile.
To become rancid, or to make something rancid.
"The oil will rancid if it is stored in a warm, open container."
The verb is less common than the adjective and is especially used in technical or culinary contexts.
Rancid is where food spoilage meets figurative bitterness: a rancid odor can be a warning, while a rancid mood has soured.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does rancid come from?
Rancid comes from Latin rancidus, meaning “rancid” or “stale,” and is related to rancere, “to smell badly” or “to rank.” The word entered English during the early modern period, initially in descriptions of spoiled or decomposed food. Its relatives include rancor and rancorous, which developed broader senses of unpleasantness, bitterness, and hostility.
Related word forms
How rancid is actually used
In its literal sense, rancid is most commonly used for food, especially oils, butter, nuts, and other fats. Its figurative use is less common and often conveys a stronger sense of persistent bitterness or unpleasantness than merely stale.
Easily confused with rancid
Rancid describes spoiled or decomposed food, while rancorous describes deep bitterness or hostility toward another person.