wherethrough

Adverb

1. Through which.
   • There was also a small window, wherethrough a prisoner might conceivably escape.
2. 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[…]. - 1603, Michel de Montaigne, chapter 12, in John Florio,...
   • 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...