wherethrough

adv

1. (archaic, not-comparable)Through which.

   “There was also a small window, wherethrough a prisoner might conceivably escape.”

2. (not-comparable, obsolete)By means of which; whereby.

   “They perceived her to be capable of diverse passions, and agitated by many languishing and painfull motions, wherethrough she fell into wearinesse and griefe[…].”

   “1874, Ernest Myers (transl.), The Extant Odes of Pindar, translated into English, Olympian Ode V, page 16. […] the river Oanis, and the lake of his native land, and the sacred channels wherethrough doth Hipparis give water to the people, […]”