[muhl-yuh
n] 
Architecture| 1. | a vertical member, as of stone or wood, between the lights of a window, the panels in wainscoting, or the like. |
| 2. | one of the radiating bars of a rose window or the like. |
| 3. | to furnish with, or to form into divisions by the use of, mullions. |
| mul·lion (mŭl'yən) n. A vertical member, as of stone or wood, dividing a window or other opening. [Alteration of Middle English moniel, from Anglo-Norman moynel, perhaps from moienel, middle, from moien, from Latin mediānus, from medius; see medhyo- in Indo-European roots.] mul'lioned (mŭl'yənd) adj. |
