Rat n. : One of several species of small rodents of the genus Mus and allied genera, larger than mice, that infest houses, stores, and ships, especially the Norway, or brown, rat (M. decumanus), the black rat (M. rattus), and the roof rat (M. Alexandrinus). These were introduced into America from the Old World.

Rat n. : A round and tapering mass of hair, or similar material, used by women to support the puffs and rolls of their natural hair.

Rat n. : One who deserts his party or associates; hence, in the trades, one who works for lower wages than those prescribed by a trades union.

Rat v. i. : In English politics, to desert one's party from interested motives; to forsake one's associates for one's own advantage; in the trades, to work for less wages, or on other conditions, than those established by a trades union.

Rat v. i. : To catch or kill rats.

Example:
How big is a pinky Rat? and at what age can i start feeding my ball python pinky RatS?

Taxonomy
rats, food, species, Rattus, brown rats, genus Rattus, Pet rats, Rattus norvegicus, humans, pets, Rattus rattus, rodent, rat species, rats as pets, diet, Singleton, Western cultures, meat prices.

Defination from the web:
rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus. ... The term "rat" is also used in the names of other small mammals which are not true rats. ...