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.
In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 
