inspector (n.) Look up inspector at Dictionary.com
c. 1600, "overseer, superintendent," from Latin inspector "one who views or observes," agent noun from past participle stem of inspicere "look at, observe, view; look into, inspect, examine," from in- "into" (see in- (2)) + specere "to look" (see scope (n.1)). As a police ranking between sergeant and superintendent, it dates from 1840. Related: Inspectorial (1752). Of the 18c. feminine formations, inspectrix (1715) is earlier than inspectress (1737).