Arch

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

2
a : something resembling an arch in form or function; especially : either of two vaulted portions of the bony structure of the foot that impart elasticity to it
b : a curvature having the form of an arch

Introduction To Architecture Architectural Dictionary of Terms, Movements and Architects by Billie Grahm & Mike Garde. All rights reserved.