Toxic \Tox"ic\, Toxical \Tox"ic*al\, a. [L. toxicum poison, originally, a poison in which arrows were dipped, Gr. toxiko`n (sc. ?) poison for smearing arrows with, fr. toxiko`s of or for the bow, from to`xon bow, arrow. Cf. Intoxicate.]

Of or pertaining to poison; poisonous; as, toxic medicines.

Source: Webster's Revised Unabridged Dictionary (1913)