borstal(n = noun.artifact) - formerly a British reform school for youths considered too young to send to prison;
is a kind of reform school, reformatory, training school
a British reform school for youths between 16 and 22. [WordNet 1.5]
borstal, n. Brit. hist. an institution for reforming and training young offenders.
Usage:
Now replaced by detention centre and youth custody centre.
Etymology:
Borstal in S. England, where the first of these was established