principal; primary
knowing, clever, mischievous
To form into an arch shape.
To cover with an arch or arches.
An architectural element having the shape of an arch
An inverted U shape.
Any place covered by an arch; an archway.
Curved part of the bottom of a foot.
A natural arch-shaped opening in a rock mass.
An arch-shaped arrangement of trapezoidal stones, designed to redistribute downward force outward.
In the highest division
Of the highest rank, or peak of excellence