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From The Collaborative International Dictionary of English v.0.48:
Guidon \Gui"don\, n. [F. guidon, It. guidone. See Guide, v. t.] 1. A small flag or streamer, as that carried by cavalry, which is broad at one end and nearly pointed at the other, or that used to direct the movements of a body of infantry, or to make signals at sea; also, the flag of a guild or fraternity. In the United States service, each company of cavalry has a guidon. [1913 Webster] The pendants and guidons were carried by the officer of the army. --Evelyn. [1913 Webster] 2. One who carries a flag. --Johnson. [1913 Webster] 3. One of a community established at Rome, by Charlemagne, to guide pilgrims to the Holy Land. [1913 Webster]