The Collaborative International Dictionary
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.
Wiktionary
a. (archaic form of toxic English)
Usage examples of "toxical".
But skilled medical provers who have experimentally tested the toxical effects of the Dandelion plant have found it to produce, when taken in excess, troublesome indigestion, characterized by a tongue coated with a white skin which peels off in patches, leaving a raw surface, whilst the kidneys become unusually active, with profuse night sweats and an itching nettle rash.
Just such a totality of symptoms has been recorded by provers after taking the fungus for some length of time in toxical quantities.
With healthy provers, who have taken the Sea Holly experimentally in toxical doses of varying strength the sexual energies and instincts became always depressed.
By what occult process of evolution did her glance derive the toxical effect of the papaver somniferum?