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 (kăp′chə) Computers
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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(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)]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Esto puede deberse a la perdida de flora y fauna y pastos naturales, que incide en la regulacion del agua mediante la poca infiltracion en la cabecera de cuenca (Bulege Gutierrez y Zarate Malpica, 2011; Carlos Gomez, Munive Cerron, Mallma Capcha y Orihuela Villavicencio, 2014; Yahdjian, Sala y Havstad, 2015).
By establishing the value of dielectric constant "k" (Capcha), charge storing capability can be determined and subsequently the capacitance (C) for the device.
But even these CAPCHA by Hotmail and G-mail have been broken by hackers recently.
CAPCHA is used as a simple puzzle (Muthukumar Subramanyam, Priya.
The Catholics introduced their new organization, the Catholic Coalition in Asia and the Pacific on HIV and AIDS (CAPCHA) that aims to deepen the involvement of Roman Catholics in HIV and AIDS.