Definition of penal colony in English English dictionary
A colonial territory used (mainly) for the detention and forced labor of deportees, typically where free labor is desperately scarce
Entire countries started as penal colonies, such as French Guyana.
Distant or overseas settlement established to punish criminals with forced labour and isolation from society. Such colonies were developed mostly by the English, French, and Russians. Britain sent criminals to its American colonies until the Revolutionary War; Australia was principally a penal colony from its colonization until the mid-19th century. French Guiana, site of a French penal colony, was infamous for its inhumanity; Devil's Island was still operating during World War II. Russian penal colonies were established in Siberia under the tsars but were most widely used during the Stalin era. Notorious for their harsh punishments and underfeeding, most penal colonies have now been abolished
a penal institution where prisoners are exiled (often located on an island from which escape is difficult or impossible)
location where convicts are sent to serve out their sentence (e.g. Australia or the state of Georgia, U.S.A. when they were under the British Empire)