hydrology Syllabification: (hy·drol·o·gy)Pronunciation: /hīˈdräləjē/Definition of hydrology noun the branch of science concerned with the properties of the earth’s water, especially its movement in relation to land. Derivatives hydrologicPronunciation: /ˌhīdrəˈläjik/ adjective hydrologicalPronunciation: /ˌhīdrəˈläjikəl/ adjective hydrologicallyPronunciation: /ˌhīdrəˈläjik(ə)lē/ adverb hydrologistPronunciation: /-jist/ noun hydrology in other Oxford dictionaries Definition of hydrology in the British & World English dictionary