or cap·tcha

[ kap-chuh ]
/ ˈkæp tʃə /

noun Digital Technology.

an online test designed so that humans but not computers are able to pass it, used as a security measure and usually involving a visual-perception task: Site visitors must solve the “distorted text” CAPTCHA before posting comments.
a computer program that generates such tests.

Origin of CAPTCHA

2000–05; C(ompletely) A(utomated) P(ublic) T(uring) (Test to Tell) C(omputers and) H(umans) A(part) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for captcha

  • Called "captcha," it's essentially a test that's easy for a human to complete, but difficult or impossible for a computer to do.

    The ESPN Porn Scam|Douglas Rushkoff|July 22, 2009|DAILY BEAST