Lewis & Short

fel, fellis, n. [Gr. χόλος, gall; cf. Germ. Galle; Engl. gall],

  1. I. the gall-bladder, gall, bile (cf. bilis): jecur a dextra parte sub praecordiis: ex inferiore parte ei fel inhaeret, Cels. 4, 1; cf. Plin. 11, 37, 74, § 191; 31, 10, 46, § 119; Ov. M. 2, 777: gallinaceum, Cic. Div. 2, 12, 29: nigrum, Plin. 11, 37, 75, § 193: piscis, Vulg. Tobiae, 6, 5.
    In plur.: fella, Ser. Samm. 19, 333; Cael. Aur. Acut. 3, 19; id. Tard. 1, 4 fin. al.
    Poet.: hic vero Alcidae furiis exarserat atro Felle dolor, because the bile was regarded as the seat of rage, Verg. A. 8, 220.
    1. B. Transf.
      1. 1. Poisonous liquid, poison (poet.): vipereum, Ov. Tr. 5, 7, 16; id. P. 1, 2, 18: sagitta armata felle veneni, Verg. A. 12, 857.
      2. 2. Fel terrae, a plant, the lesser centaury, the fumitory (Fumaria officinalis, Linn.), Plin. 25, 6, 31, § 68.
  2. II. Trop. (only in poets, whereas bilis is used in the trop. signif. also in good prose), bitterness, acrimony, animosity (syn.: bilis, stomachus, invidia, livor; odium): amor et melle et felle est fecundissimus, Plaut. Cist. 1, 1, 70; cf.: corda felle sunt lita, id. Truc. 1, 2, 77: omnia jam tristi tempora felle madent, Tib. 2, 4, 11; Mart. 7, 25.