Wordnet 3.0
NOUN (1)
1.
formerly a British reform school for youths considered too young to send to prison;
The Collaborative International Dictionary of English v.0.48:
Borstal \Borstal\ n.
a British reform school for youths between 16 and 22.
[WordNet 1.5]
WordNet (r) 3.0 (2006):
borstal
n 1: formerly a British reform school for youths considered too
young to send to prison
Moby Thesaurus II by Grady Ward, 1.0:
47 Moby Thesaurus words for "borstal":
POW camp, bastille, black hole, borstal institution,
borstal school, bridewell, brig, cell, concentration camp,
condemned cell, death cell, death house, death row, detention camp,
federal prison, forced-labor camp, gaol, guardhouse,
house of correction, house of detention, industrial school,
internment camp, jail, jailhouse, keep, labor camp, lockup,
maximum-security prison, minimum-security prison, oubliette, pen,
penal colony, penal institution, penal settlement, penitentiary,
prison, prison camp, prisonhouse, reform school, reformatory,
remand school, sponging house, state prison, stockade, the hole,
tollbooth, training school