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

:  either of two vaulted portions of the bony structure of the foot that impart elasticity to it

:  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

: archaic

: archery

: architect; architectural; architecture