SPILE

Spile (spīl), n. [[Cf. LG. spile, dial. G. speil, speiler, D. spijl. √170.]] 1. 1. A small plug or wooden pin, used to stop a vent, as in a cask.
2. 2. A small tube or spout inserted in a tree for conducting sap, as from a sugar maple.
3. 3. A large stake driven into the ground as a support for some superstructure; a pile.
Spile hole, a small air hole in a cask; a vent.