Mū'ral, a.

adjective

a. [Fr. & Sp. mural, It. murale, Lat. muralis, from murus, wall. See MURE.]

  1. Pertaining to a wall. “Mural breach.” Milton.
  2. Resembling a wall; perpendicular or steep; as, a mural precipice.

Mural circle (Astron.), a graduated circle, in the plane of the meridian, attached permanently to a perpendicular wall;—used for measuring arcs of the meridian. The term mural is also applied to any other instrument similarly mounted; as, a mural quadrant; a mural sector.—Mural crown (Rom. Antiq.), a golden crown, or circle of gold, indented so as to resemble a battlement, bestowed on him who first mounted the wall of a besieged place, and there lodged a standard.

A labeled diagram of a mural circle with a reading microscope attached to a wall.
Mural Circle.
A heraldic mural crown with a circular battlemented band and several towers rising above it.
Mural Crown.