n. 看守监狱的人, 狱卒

[ noun ]
someone who guards prisoners
<noun.person>

Jailer \Jail"er\, n. [OE. jailer, gailer, OF. geolier, F.
ge[^o]lier. See {Jail}.]
The keeper of a jail or prison. [Written also {jailor},
{gaoler}.]