noun
curvature
KUR-vuh-chur/ˈkɜːrvətʃər/
The state or degree of being curved rather than straight or flat.
The three strips show increasing curvature.

Etymology
Latin curvatura named a bending. Curvature treats continuous bending as a property of a line or surface, describing either its curved state or how pronounced the bending is.
In context
the side that's away from the light to lengthen and the cells on this side of the stem to contract or not get as big which results in a curvature of the entire individual
More examples
- They measured the curvature of the road.
- The drawing exaggerated the spine's curvature.
- Changing the curvature altered how the mirror focused light.
Forms
curvature
curve verb — bend from a straight course