WordReference Random House Learner's Dictionary of American English © 2014
sem•a•phore /ˈsɛməˌfɔr/USA pronunciation
n., v., -phored, -phor•ing.
- [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.
- [countable] an apparatus used in this system.
- 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
- an apparatus for conveying information by means of visual signals, as with movable arms or railway signals, flags, etc
- 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
Etymology: 19th Century: via French, from Greek sēma a signal + -phoresemaphoric /ˌsɛməˈfɒrɪk/, ˌsemaˈphorical adj
- to signal (information) by means of semaphore
'semaphore' also found in these entries: