Definition of semaphore noun from the Oxford Advanced Learner's Dictionary

 

semaphore

 noun
noun
BrE BrE//ˈseməfɔː(r)//
 
; NAmE NAmE//ˈseməfɔːr//
 
 
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[uncountable] a system for sending signals in which you hold your arms or two flags in particular positions to represent different letters of the alphabet Word Origin early 19th cent. (denoting a signalling apparatus): from French sémaphore, formed irregularly from Greek sēma ‘sign’ + -phoros.
See the Oxford Advanced American Dictionary entry: semaphore

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