A sensation, pleasant or unpleasant, detected by inhaling air (or, the case of water-breathing animals, water) carrying airborne molecules of a substance.

(physiology) The sense that detects odours.

A conclusion or intuition that a situation is wrong, more complex than it seems, or otherwise inappropriate.

(transitive) To sense a smell or smells.

(intransitive, copulative) Followed by like or of if descriptive: to have a particular smell, whether good or bad.

(intransitive, without a modifier) To smell bad; to stink.

(intransitive, figurative) To have a particular tincture or smack of any quality; to savour.

To detect or perceive; often with out.

(transitive) To smell of; to have a smell of