CAPTCHA

American  

[kap-chuh] / ˈkæp tʃə /

Or captcha

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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Etymology

Origin of CAPTCHA

First recorded in 2000–05; C(ompletely) A(utomated) P(ublic) T(uring) (Test to Tell) C(omputers and) H(umans) A(part); inspired by capture ( def. )

Example Sentences

The group found that the system was able to hire a human online to defeat a Captcha test.

From New York Times

This is sort of like — it’s occurring to me that we basically designed a CAPTCHA.

From New York Times

Other new security features including the option of authenticator apps - an extra security log-in step, and using Captcha images will also be added.

From BBC

When Romero Zavala returned to the civil registry site two days later, he was greeted with a captcha — one of those “I’m not a robot” boxes meant to block automated users.

From Washington Post

Once you’ve agreed, enter your email address and complete the CAPTCHA.

From Fox News