Enter a clue or pattern or both:
The Clue
Arch (9 letter answer)
The Answer
CURVATURE
Tags
Notes
The answer CURVATURE is so rare that it appears less than once every 2500 puzzles.
Definition
CURVATURE as a noun:
1. (medicine) a curving or bending; often abnormal; "curvature of the spine"
2. the rate of change (at a point) of the angle between a curve and a tangent to the curve
3. (curvature, curve) = the property possessed by the curving of a line or surface