Compass window Meaning, Definition & Usage

Definitions
  1. (Arch.), a circular bay window or oriel window. It has two or more magnetic needles permanently attached to a card, which moves freely upon a pivot, and is read with reference to a mark on the box representing the ship's head. The card is divided into thirty-two points, called also rhumbs, and the glass-covered box or bowl containing it is suspended in gimbals within the binnacle, in order to preserve its horizontal position.

Webster 1913