/ dʒiˈɒlədʒi; NAmE -ˈɑːl-/ noun
1.
[ U ] the scientific study of the earth, including the origin and history of the rocks and soil of which the earth is made
2.
[ sing. ] the origin and history of the rocks and soil of a particular area :
the geology of the British Isles
► geo·logic·al / ˌdʒiːəˈlɒdʒɪkl; NAmE -ˈlɑːdʒ-/ adjective :
a geological survey
► geo·logic·al·ly / ˌdʒiːəˈlɒdʒɪkli; NAmE -ˈlɑːdʒ-/ adverb
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WORD ORIGIN
late 18th cent.: from modern Latin geologia , from Greek gē earth + -logia (see -logy ).