captcha

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noun capt·cha \ˈkap-chə\

Definition of captcha

  1. :  a test to prevent spamming software from accessing a website by requiring visitors to the site to solve a simple puzzle (typically by reading and transcribing a series of numbers or letters from a distorted image) in order to gain access <The point of the CAPTCHA is that reading those swirly letters is something that computers aren't very good at. If you can read them, you're probably not a piece of software run by a spammer. — Leviticus Grossman>

Variants of captcha

or

CAPTCHA

Origin and Etymology of captcha

Completely Automatic Public Turing test to tell Computers and Humans Apart (with deliberate pun on 1capture)


First Known Use: 2001



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