Sill, Cill, or Sole

Sill, Cill, or Sole (Fr. seuil, from Lat. solum).

1. The horizontal piece of timber or stone forming the bottom of a window, doorway, or other similar opening.

2. Also the horizontal piece of timber, or plate, at the bottom of a wooden partition.

3. Also the horizontal piece of timber near the base of houses which are built partly of timber and partly of brick. — Parker, Gloss. of Architect. s.v.