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mul·lion

(mŭlyən)

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 the Appendix of Indo-European roots.]

mullioned (mŭlyənd) adj.

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mullion

mullioned windows

Indo-European & Semitic Roots Appendices

Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

Indo-European Roots

Semitic Roots

The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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