rat

(zoology) A medium-sized rodent belonging to the genus Rattus.

(informal) Any of the numerous members of several rodent families (e.g. voles and mice) that resemble true rats in appearance, usually having a pointy snout, a long, bare tail, and body length greater than about 12 cm, or 5 inches.

(informal) A person who is known for betrayal; a scoundrel; a quisling.

(informal) An informant or snitch.

(informal) A scab: a worker who acts against trade union policies.

(slang) A person who routinely spends time at a particular location.

A wad of shed hair used as part of a hairstyle.

A roll of material used to puff out the hair, which is turned over it.

(UK, north-west London, slang, vulgar) Vagina.

(chiefly informal) Short for muskrat.