WordReference Random House Unabridged Dictionary of American English © 2026
hy•dro•ge•ol•o•gy
(hī′drō jē ol′ə jē),USA pronunciation n.
hy•dro•ge•o•log•i•cal
(hī′drə jē′ə loj′i kəl),USA pronunciation hy′dro•ge′o•log′ic, adj.
hy′dro•ge•ol′o•gist, n.
- Geologythe science dealing with the occurrence and distribution of underground water. Also called hydrology, geohydrology.
- 1815–25; hydro-1 + geology
'hydrogeology' also found in these entries (note: many are not synonyms or translations):