lie-detector

The term 'lie-detector' is a modern compound noun, transparently constructed from its constituent parts. The word 'lie' originates from the Old English 'lyge', a common Germanic term for a falsehood. 'Detector' derives from the Latin verb 'detegere', meaning 'to uncover or expose', which itself is formed from 'de-' (off, away) and 'tegere' (to cover). The suffix '-or', a Latin agent-noun ending, is used in English to form words for instruments or devices. Thus, the literal logic of the word is "a thing that uncovers a falsehood," a meaning that directly aligns with its modern function of revealing deception through physiological measurement.

Structure: lie (false statement) + detect (discover) + or (agent suffix) lie: From Old English 'lyge', a false statement. Functional role: The object or target of the action. detect: From Latin 'detectus', past participle of 'detegere' meaning 'to uncover, expose'. Functional role: The core action performed. or: A suffix forming agent nouns from verbs, indicating a person or thing that performs the action. Functional role: Denotes the instrument or device.