Meaning of “geology” - Learner’s Dictionary

geology

noun [ U ] us uk /dʒiˈɒlədʒi/

the study of rocks and soil and the physical structure of the Earth

geological adjective us uk /ˌdʒiːəʊˈlɒdʒɪkəl/
geologist noun [ C ]

someone who studies geology

(Definition of “geology” from the Cambridge Learner’s Dictionary © Cambridge University Press)