(US, dated, slang) A juvenile criminal gang.

Alternative spelling of ratfolk

plural of Rat Indian

The brown rat (Rattus norvegicus). / (derogatory) A base and contemptible person. / Used other than figuratively or idiomatically: Any rat that lives in sewers.

Lophiomys imhausi, a nocturnal, long-haired and bushy-tailed East African rodent that superficially resembles a porcupine.

maned rat

plural of rat-baiting

Alternative form of rathole

Alternative form of lab rat

(idiomatic) A student or employee who spends a great deal of time working in a laboratory.