Captchan.

Brit.

/ˈkaptʃə/, U.S.

/ˈkæp(t)ʃə/

Forms: 2000s– CAPTCHA, 2000s– Captcha, 2000s– captcha.

Origin: Formed within English, as an acronym. Etymon: English completely automatic public Turing test to tell computers and humans apart.

Etymology: Acronym < the initial letters of completely automatic public Turing test to tell computers and humans apart, with punning allusion to capture n.

Computing.

Any of various authentication systems devised to enable a computer to distinguish human from computer input, typically in order to thwart spam or to prevent automated misuse of a website; a manifestation of such a system, esp. a string of distorted letters that a user must read and key in correctly to proceed.

ΚΠ

2001 Trends Cognitive Sci. 5 512/1 A group of researchers at the Aladdin Center at Carnegie-Mellon University has come up with such a test, which they call a CAPTCHA.

2006 Wired Sept. 114/3 Sploggers are believed to be hiring squads of low-paid people to type through the tests. ‘We're seeing Captchas solved in bursts, which suggests they are working in shifts.’

2008 Independent 16 Apr. 11/2 Security firms have noted that Captchas for the most popular webmail services have been broken.

2009 P. Vora Web Applic. Design Patterns 59 CAPTCHA images typically have about four to five distorted alphanumeric characters.

2012 Sun (Nexis) 3 Jan. 21 Ryanair customers are routinely prompted to enter random ‘captcha’ words as part of the booking site's defences against spam attacks.

This is a new entry (OED Third Edition, December 2012; most recently modified version published online December 2021).

单词	captcha
释义	Captchan. Brit. /ˈkaptʃə/, U.S. /ˈkæp(t)ʃə/ Forms: 2000s– CAPTCHA, 2000s– Captcha, 2000s– captcha. Origin: Formed within English, as an acronym. Etymon: English completely automatic public Turing test to tell computers and humans apart. Etymology: Acronym < the initial letters of completely automatic public Turing test to tell computers and humans apart, with punning allusion to capture n. Computing. Any of various authentication systems devised to enable a computer to distinguish human from computer input, typically in order to thwart spam or to prevent automated misuse of a website; a manifestation of such a system, esp. a string of distorted letters that a user must read and key in correctly to proceed. ΚΠ 2001 Trends Cognitive Sci. 5 512/1 A group of researchers at the Aladdin Center at Carnegie-Mellon University has come up with such a test, which they call a CAPTCHA. 2006 Wired Sept. 114/3 Sploggers are believed to be hiring squads of low-paid people to type through the tests. ‘We're seeing Captchas solved in bursts, which suggests they are working in shifts.’ 2008 Independent 16 Apr. 11/2 Security firms have noted that Captchas for the most popular webmail services have been broken. 2009 P. Vora Web Applic. Design Patterns 59 CAPTCHA images typically have about four to five distorted alphanumeric characters. 2012 Sun (Nexis) 3 Jan. 21 Ryanair customers are routinely prompted to enter random ‘captcha’ words as part of the booking site's defences against spam attacks. This is a new entry (OED Third Edition, December 2012; most recently modified version published online December 2021). < n.2001
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