# lie detector

> English word · Noun

## Definitions
1. A device designed to detect or indicate when a person is lying by measuring and recording several physiological variables.

## Etymology
From lie + detector. First use appears c. 1909. See cite below.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/lie-detector