oillet

In the times of castle warfare, these were windows that went through thick walls of the front of the castle where the window was wider on the inside than on the outside. A benefit to such windows is it was easy to fire an arrow out, but archers on the outside would have trouble firing back at you.
A word that rhymes with toilet.

King: Install an oillet in the front of my castle.
Servant: As you wish.

by ManMan36 January 4, 2016