WordReference Random House Unabridged Dictionary of American English © 2025
as•tro•ge•ol•o•gy
(as′trō jē ol′ə jē),USA pronunciation n.
as•tro•ge•o•log•ic
(as′trō jē′ə loj′ik),USA pronunciation adj.
- Astronomy, Geologythe science dealing with the structure and composition of planets and other bodies in the solar system.
- astro- + geology