A distinctive smell.

A smell left by an animal that may be used for tracing.

The sense of smell.

(chiefly uncountable) A substance (usually liquid) created to provide a pleasant smell.

(figurative) Any trail or trace that can be followed to find something or someone, such as the paper left behind in a paperchase.

(transitive) To detect the scent of; to discern by the sense of smell.

(transitive, intransitive) To inhale in order to detect the scent of (something).

(transitive, figurative) To have a suspicion of; to detect the possibility of (something).

(transitive) To impart an odour to, to cause to have a particular smell.

To hunt animals by means of the sense of smell.