mural

a. [ F., fr. L. muralis, fr. murus wall. See Mure a wall. ] 1. Of or pertaining to a wall; being on, or in, a wall; growing on, or against, a wall; as, a mural quadrant. “Mural breach.” Milton. “Mural fruit.” Evelyn. [ 1913 Webster ]

2. Resembling a wall; perpendicular or steep; as, a mural precipice. [ 1913 Webster ]

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. See Circle, n., 3. --
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. [ 1913 Webster ]