Webster's Revised Unabridged Dictionary · 1913

Penthouse

Penthouse , noun

[A corruption of pentice.]

A shed or roof sloping from the main wall or building, as over a door or window; a lean-to. Also figuratively.
The penthouse of his eyes. — Sir W. Scott

Penthouse , adjective

Leaning; overhanging.
Penthouse lid. — Shakespeare
My penthouse eyebrows. — Dryden