WordReference Random House Learner's Dictionary of American English © 2014
sem•a•phore /ˈsɛməˌfɔr/USA pronunciation  n., v.,  -phored, -phor•ing.

  1. [uncountable] a system of signaling, esp. one by which a flag is held in each hand and various positions of the arms indicate specific letters, etc.
  2. [countable] an apparatus used in this system.

  1. to signal by semaphore: [+ object]to semaphore a message.[no object]busily semaphoring to the other ship.

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

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