Garret
GARRET (from the O. Fr. garite, modern guérite, a watch-tower, connected ultimately with "guard" and "ward"), properly a small look-out tower built on a wall, and hence the name given to a room on the top storey of a building, the sloping ceiling of which is formed by the roof.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)