Collins Concise English Dictionary © HarperCollins Publishers::

semaphore /ˈsɛməˌfɔː/ n
  1. an apparatus for conveying information by means of visual signals, as with movable arms or railway signals, flags, etc
  2. a system of signalling by holding a flag in each hand and moving the arms to designated positions to denote each letter of the alphabet
  1. to signal (information) by means of semaphore
Etymology: 19th Century: via French, from Greek sēma a signal + -phore

semaphoric /ˌsɛməˈfɒrɪk/, ˌsemaˈphorical adj

'semaphore' also found in these entries:
In the English description:

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