Definitions

1. noun

A rail or rod that serves as the upper limit of a window treatment, such as curtains or blinds.

“The headrail of her blackout curtains was damaged, so she couldn’t close them properly.”

2. noun

A horizontal bar or rod that supports or guides the movement of something, especially a window treatment or a stage.

“The headrail of the stage was designed to move in sync with the actors.”