Definify.com
Webster 1913 Edition
Guidon
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.
The pendants and
guidons
were carried by the officer of the army. Evelyn.
2.
One who carries a flag.
Johnson.
3.
One of a community established at Rome, by Charlemagne, to guide pilgrims to the Holy Land.
Webster 1828 Edition
Guidon
GUIDON
,Noun.