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any of various large tropical carnivorous lizards of Africa and Asia and Australia
someone who supervises (an examination)
keep tabs on
display consisting of a device that takes signals from a computer and displays them on a CRT screen
the act of observing something (and sometimes keeping a record of it)
an iron-clad vessel built by Federal forces to do battle with the Merrimac
electronic equipment that is used to check the quality or content of electronic transmissions
a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble
someone who gives a warning so that a mistake can be avoided