A rat used in a laboratory for scientific experiments / Synonym of lab rat

plural of laboratory rat

(zoology) Alternative form of water rat

The sound made by knocking on a door with a hard object (such as a door knocker). / The sound made by firing an automatic machine gun.

Such a sound.

A series of short, sharp taps, especially made by knocking on a door, beating a drum, or firing an automatic weapon

A series of short, sharp taps, especially made by knocking on a door, beating a drum, or firing an automatic weapon

The black rat.

plural of Asian black rat

A rat that lives in the Himalayas and southeast Asia; taxonomic name Rattus nitidus.