From WordNet (r) 3.0 (2006):
gaol
n 1: a correctional institution used to detain persons who are
in the lawful custody of the government (either accused
persons awaiting trial or convicted persons serving a
sentence) [syn: jail, jailhouse, gaol, clink,
slammer, poky, pokey]
v 1: lock up or confine, in or as in a jail; "The suspects were
imprisoned without trial"; "the murderer was incarcerated
for the rest of his life" [syn: imprison, incarcerate,
lag, immure, put behind bars, jail, jug, gaol,
put away, remand]