captcha

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capt·cha

 (kăp′chə) Computers
n.
A security feature, as on a webpage, that attempts to distinguish between legitimate human users and bots by requiring users to perform a mildly challenging task such as deciphering distorted text.

[Acronym of c(ompletely) a(utomated) p(ublic) T(uring test to tell) c(omputers and) h(umans) a(part), coined in 2000 by the researchers who developed the security feature and intended to suggest a colloquial pronunciation of capture.]

captcha

(ˈkæptʃə)
n
(Communications & Information) a test in which the user of a website is asked to decipher a distorted image, used to protect the website against automated attacks
[C21: acronym for C(ompletely) A(utomated) P(ublic Turing Test to) T(ell) C(omputers and) H(umans) A(part)]
References in periodicals archive ?
Today, here's how you purchase tickets to the latest blockbuster: log in to your web account, select your tickets, type in your credit card number, prove you're human, try again, type in the security code, look for another code in the SMS you just received, open the email with your QR code, and show those to a human with a scanner at the turnstile.