"of the color of a dead leaf," 1640s, fieulamort, from French feuille morte, literally "dead leaf" (see folio + mortal (adj.)). A word of loose spelling, variants include phyllamort, filemot, philomot.
fetus
feu de joie
feud
feudal
feudalism
feuillemorte
feuilleton
fever
feverfew
feverish
feverous