- sphenoidal
- sphenoid bone
- sphenoids
- spher-
- spheral
- sphere
- sphered
- sphere of influence
- spheres
- spherical
- spherical aberration
- spherical angle
- spherical coordinate
- spherical-coordinate system
- spherical excess
- spherical geometry
- spherical polygon
- spherical triangle
- spherical trigonometry
- spherics
- spherics
- spherier
- spheriest
- sphering
- sphero-