Definition of captcha in English:

captcha

Syllabification: captcha
Pronunciation: /ˈkapSHə
 
/
(also CAPTCHA)

noun

A program or system intended to distinguish human from machine input, typically as a way of thwarting spam and automated extraction of data from websites.
More example sentences
  • The spammers are thinking up ever more ingenious ways to break the captchas.
  • Every time you edit a page, you have to pass a captcha.
  • I guess the spammers tools are too simplistic to even attempt to break the captcha.

Origin

early 21st century: acronym from completely automated public Turing test to tell computers and humans apart.

Definition of captcha in:

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