surveillant[-vā′lənt; occas., -vāl′yənt]
a person who watches, observes, or supervises
One that exercises surveillance.
Origin of surveillantFrench, present participle of surveiller, to watch over : sur-, over (from Old French; see sur–) + veiller, to watch (from Old French veillier, from Latin vigilāre, from vigil, watchful; see weg- in Indo-European roots).
(comparative more surveillant, superlative most surveillant)
- overseeing; watchful
- One who watches over another; an overseer; a spy; a supervisor.