ge ‧ ol ‧ o ‧ gy /dʒiˈɒlədʒi $ -ˈɑːlə-/ BrE AmE noun [uncountable]
[ Date: 1700-1800 ; Language: Modern Latin ; Origin: geologia , from Greek ge ( ⇨ ↑ geo- ) + -logia ( , ↑ -logy %) ]
the study of the rocks, soil etc that make up the Earth, and of the way they have changed since the Earth was formed
—geologist noun [countable]
—geological /ˌdʒiːəˈlɒdʒɪk ə l◂ $ -ˈlɑː-/ adjective
—geologically /-kli/ adverb