Abbott-Smith Manual Greek Lexicon
πικρία (G4088)
4 πικρία , -ας, ἡ ( πικρός ), [in LXX chiefly for מַר , מָרָה and cognate forms;] bitterness ; of taste (Arist., Je 15:17 , al.); metaph., of temper, character, etc.: Ro 3:14 (LXX) , Eph 4:31 ; ῥίζα πικρίας , He 12:15 ; χολὴ π. , a malignant disposition , Ac 8:23 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain