flair (Fr.), scent, keen sense of smell.
flectere si nequeo superos, Acheronta movebo (L.), if I can't move the gods, I'll stir up hell.
flecti, non frangi (L.), to be bent, not to be broken.
fleuron (Fr.), a piece of decorative flower-work.
flocculus, pl. flocculi (Late L.), a small flock or tuft of wool or the like.
floreat (L.), let it flourish.
florilegium, pl. florilegia (Late L.), a collection of flowers—i.e. of choice passages, an anthology.
flosculi sententiarum (L.), flowerets of wisdom.
fœnum habet in cornu (L.), he has hay on his horn [the sign of a dangerous bull].
foiblesse (Old French; modern, faiblesse), a failing.