from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. Archaic On which or what: "the ground whereon she trod” ( John Milton).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. On which, on what.
from the GNU version of the Collaborative International Dictionary of English
- adv. On which; -- used relatively.
- adv. On what; -- used interrogatively; as, whereon do we stand?
from The Century Dictionary and Cyclopedia
- On what? on whom?
- On which.
Sorry, no etymologies found.