magnesian

Containing appreciable amount of dolomite.

marble

Metamorphosed limestone.

mason's mitre

Birdsmouth joint on an arris.

merlon

The sollid portions at a battlemented parapet between embrasures.

metamorphic rock

Rock recrystallised from pre-existing solid rock masses by the action of heat, and/or pressure.

metope

The square space between two triglyphs in the frieze of a Doric order.

modillion

A bracket supporting a classical cornice.

monolith

A large single stone.

mouldings

The contours given to projecting members.

mullion

Vertical divider of window.

mutule

The projecting square block above the triglyph and on the soffit of a Doric cornice.