IPA: /dɪˈtɛktər/
KK: /dɪˈtɛktər/
A person or device that discovers or identifies something that is hidden or not easily seen.
The smoke detector alerted us to the fire in the kitchen.
Detecter → It is formed from 'detect' (from Latin 'detegere', meaning to uncover or reveal) and '-er' (meaning a person who). The word 'detecter' refers to a person who uncovers or reveals something, typically in the context of finding hidden information or objects.
Think of someone who 'uncovers' ('detegere') hidden things — that's why a detecter is a person who reveals or finds what is concealed.