proscenium arch

: the stage of an ancient Greek or Roman theater

: the part of a modern stage in front of the curtain

: the wall that separates the stage from the auditorium and provides the arch that frames it

: a typically curved structural member spanning an opening and serving as a support (as for the wall or other weight above the opening)

: something resembling an arch in form or function

: something that has a curved shape like an arch

: to cover or provide with an arch

: to form into an arch

: to form an arch

: principal, chief

: mischievous, saucy

: marked by a deliberate and often forced playfulness, irony, or impudence

: chief : principal

: extreme : most fully embodying the qualities of the kind

— see archi-

: ruler : leader

: having (such) a point or (so many) points of origin