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Webster's Dictionary (1865)

Fān'on, n.

noun

n. [O. Fr. fanon, altar-ornament, a scarf on the priest’s arm, L. Lat. fano, from O. H. Ger. fano, banner; L. Lat. fanonellus, faniculus, diminutive from fano, priestly banner. See FANION.]

  1. An embroidered scarf, worn about the left arm of a Roman Catholic priest, in the celebration of the mass. [Written also fannel.] Fairholt.
  2. A flag; an ensign.