Having an acid or sharp, biting taste, like vinegar, and the juices of most unripe fruits; acid; tart.

Changed, as by keeping, so as to be acid, rancid, or musty, turned.

Disagreeable; unpleasant; hence; cross; crabbed; peevish; morose; as, a man of a sour temper; a sour reply.

A sour or acid substance; whatever produces a painful effect.

smelling of fermentation or staleness

Undesirable " diry socks" flavor of over-fermentation.

A perfume is said to smell sour when it has aged prematurely owing to inappropriate storage. When this happens, chemical alterations occur which are irreversible, and the perfume must be considered "off."