One who detects; a person or device that discovers or finds something hidden or obscure.
From 'detect' plus -er (agent suffix marking 'one who does the action'). An older or alternative spelling to 'detector,' still used in some contexts.
The difference between 'detector' and 'detecter' is like -or vs -er endings in English—both are correct, but one becomes standard over time. Language is democratic: the version people use most wins!
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