attic

Etymology

From the practice of decorating the top storey of building facades in the Attic architectural style. From French attique, from Latin atticus, from Ancient Greek Ἀττικός (Attikós).

noun

1. The space, often unfinished and with sloped walls, directly below the roof in the uppermost part of a house or other building, generally used for storage or habitation.
   We went up to the attic to look for the boxes containing our childhood keepsakes.
2. (slang) A person's head or brain.
   […] was a diminutive, forked-radish sort of a young man, very fashionably attired, or, as he would say, kiddily togg'd; and, though it was scarcely noon, he was rather queer in the attic; that is to say, not exactly sober. 1875, John Wight, Mornings at Bow Street, page 105