flathon--prophetes.ai

† ˈflathon Obs.
  Also flathoun.
  [ad. med.L. flatōn-em, fladōn-em: see flawn.]
  = flawn.

c 1430 Two Cookery Bks. i. 56 Flathouns in lente. c 1450 Ibid. ii. 73 Flathonys.

Oxford English Dictionary