One who admonishes; one who warns of faults, informs of
duty, or gives advice and instruction by way of reproof or caution.

Hence, specifically, a pupil selected to look to the
school in the absence of the instructor, to notice the absence or
faults of the scholars, or to instruct a division or class.

Any large Old World lizard of the genus Varanus; esp., the
Egyptian species (V. Niloticus), which is useful because it devours the
eggs and young of the crocodile. It is sometimes five or six feet long.

An ironclad war vessel, very low in the water, and having
one or more heavily-armored revolving turrets, carrying heavy guns.

A tool holder, as for a lathe, shaped like a low turret,
and capable of being revolved on a vertical pivot so as to bring
successively the several tools in holds into proper position for
cutting.