mullion

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mullion. Vertical post between the lights of a window or screen. Stone and timber mullions are usually moulded. Square timber mullions set diagonally on plan in a medieval aperture are called diamond mullions, while windows with four or more lights may have subsidiary mullions subdividing the window into lights and larger mullions corresponding to the aperture proper called king-mullions.

mullion , in architecture, a slender, upright intermediate member that subdivides an opening, as a division between panes of a window or between adjacent windows. Although the mullion occurs in some form in nearly all architectural styles, it is perhaps most characteristic of the elaborate Gothic systems of stone tracery .

mul·lion / ˈməlyən/ • n. a vertical bar between the panes of glass in a window. Compare with transom. DERIVATIVES: mul·lioned adj.

mullion (archit.) vertical bar dividing the lights of a window. XVI. metathetic alt. of ME. munial, MONIAL, as the contemp. munnion is an assim. form (n … l to n … n).

Mullion Cornwall. ‘Church of Sanctus Melanus’ 1262. From the patron saint of the church.

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