grav·i·sphere 
(grăvĭ-sfîr′)
(grăvĭ-sfîr′)n.
The spherical region of space dominated by the gravitational field of a celestial body.
[GRAVI(TY) + SPHERE.]
- illusion
- illusional
- illusionary
- illusionism
- illusionist
- illusionistic
- illusionistically
- illusionless
- illusive
- illusively
- illusiveness
- illusory
- illustratable
- illustrate
- illustration
- illustrational
- illustrative
- illustratively
- illustrator
- illustrious
- illustriously
- illustriousness
- illuvial
- illuviate
- illuviation