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CAPTCHA

or cap·tcha

[kap-chuh]
noun Digital Technology.
  1. 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.
  2. a computer program that generates such tests.
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Origin of CAPTCHA

2000–05; C(ompletely) A(utomated) P(ublic) T(uring) (Test to Tell) C(omputers and) H(umans) A(part)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for captcha

Contemporary Examples