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1 definition found
 for M roof
From The Collaborative International Dictionary of English v.0.48 :

  M \M\, n.
     1. (Print.) A quadrat, the face or top of which is a perfect
        square; also, the size of such a square in any given size
        of type, used as the unit of measurement for that type:
        500 m's of pica would be a piece of matter whose length
        and breadth in pica m's multiplied together produce that
        number. [Written also em.]
        [1913 Webster]
     2. (law) A brand or stigma, having the shape of an M,
        formerly impressed on one convicted of manslaughter and
        admitted to the benefit of clergy.
        [1913 Webster]
     M roof (Arch.), a kind of roof formed by the junction of
        two common roofs with a valley between them, so that the
        section resembles the letter M.
        [1913 Webster]

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