PRONUNCIATION: (KAP-chuh)
http://wordsmith.org/words/captcha.mp3
MEANING: (noun), A test used to make sure that a human is using a system, not a computer program. The test typically involves reading distorted text.
ETYMOLOGY: An acronym of Completely Automated Public Turing Test to tell Computers and Humans Apart. The Turing test is named after Alan Turing, a mathematician and computer scientist, who proposed that a computer could be considered intelligent if, while interacting with a human and a computer, someone could not tell which is which. A captcha is a kind of reverse Turing test. Earliest documented use: 2001.
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http://www.vocabulary.com/dictionary/captcha
Explore “captcha” in the Visual Thesaurus.
http://visualthesaurus.com/?w1=captcha