captcha
/K AE1 P CH AH0/noun
- 1
A computerized test requiring the human user to perform a task deemed to be difficult to automate, such as entering a displayed series of distorted characters or describing images, to demonstrate that he/she is a human and not a computer program.
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Source: https://en.wiktionary.org/wiki/CAPTCHA, https://en.wiktionary.org/wiki/captcha