de·tec·tor 
/dɪˈtɛktɚ/ noun
plural de·tec·tors /dɪˈtɛktɚ/ noun [count] : a device that can tell if a substance or object is present : a device that detects the presence of something
▪ a smoke/radar detector ▪ using metal detectors to improve safety at airports — see also lie detector
▪ a smoke/radar detector ▪ using metal detectors to improve safety at airports — see also lie detector
