cap·tcha (also CAPTCHA) BrE/ˈkæptʃə/NAmE/ˈkæptʃə/noun[C, U]acomputerprogramthatisdesignedtodistinguishbetweenhumanusersandmachines, oftenshowinglettersornumberswiththeirshapechangedslightly人机验证，验证码（一种区分计算机和人类用户的计算机程序）◆Thecaptchacanonlybesolvedbyhumans.只有人类能识别验证码。ORIGINAnacronymfromCompletelyAutomatedPublicTuringtesttotellComputersandHumansApart. * captcha 是 Completely Automated Public Turing test to tell Computers and Humans Apart（全自动区分计算机和人类的公开图灵测试）的首字母缩略词。