S: (n) Monitor (an ironclad vessel built by Federal forces to do battle with the Merrimac)
S: (n) monitor, monitoring device (display produced by a device that takes signals and displays them on a television screen or a computer monitor)
S: (n) monitor (electronic equipment that is used to check the quality or content of electronic transmissions)
S: (n) monitor (a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble)
S: (n) monitor, monitor lizard, varan (any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles)
S: (n) saurian (any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs)
S: (n) reptile, reptilian (any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms)
S: (n) vertebrate, craniate (animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium)
S: (v) monitor, supervise (keep tabs on; keep an eye on; keep under surveillance) "we are monitoring the air quality"; "the police monitor the suspect's moves"
S: (v) monitor (check, track, or observe by means of a receiver)