The Collaborative International Dictionary of English v.0.48:
Fess \Fess\, Fesse \Fesse\, n. [OF. fesse, faisse, F. fasce, fr. L. fascia band. See Fascia.] (Her.) A band drawn horizontally across the center of an escutcheon, and containing in breadth the third part of it; one of the nine honorable ordinaries. [1913 Webster] Fess point (Her.), the exact center of the escutcheon. See Escutcheon. [1913 Webster]