One of the mysteries of the English language finally explained.
1A bar, or each of a number of bars, fixed over a window, chiefly to prevent occupants from falling out or intruders from gaining access.
2A bar used to secure shutters when closed.
3A bar dividing panes of glass in a window; a muntin; a mullion.
Early 17th century; earliest use found in Simon Sturtevant (fl. 1612).
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