WordReference Random House Unabridged Dictionary of American English © 2026
hy•drol•o•gy
(hī drol′ə jē),USA pronunciation n.
hy•dro•log•ic
(hī′drə loj′ik),USA pronunciation hy′dro•log′i•cal, adj.
hy′dro•log′i•cal•ly, adv.
hy•drol′o•gist, n.
- Geologythe science dealing with the occurrence, circulation, distribution, and properties of the waters of the earth and its atmosphere.
- Geologyhydrogeology; geohydrology.
- hydro-1 + -logy 1755–65
hy•drol′o•gist, n.