Emily Dickinson Lexicon

TUN'NEL, n. [Fr. tonnelle.]

1. A vessel with a broad mouth at one end, and a pipe or tube at the other, for conveying liquor into casks, bottles, &c.
2. The opening of a chimney for the passage of smoke; called generally a tunnel.
3. A large subterraneous arch through a hill for a canal and the passage of boats. Smaller drains or culverts are also called tunnels. – Cyc.
4. An arched way or road under ground or a river; as, the tunnel under the Thames in England.