British spelling: to study rocks and Earth's structure, or to examine something from a geological perspective.
From geology + -ise (British suffix for verbs, equivalent to American -ize). This British variant spelling became standard in UK English during the 19th century.
British and American English diverged in their verb endings—'geologise' vs 'geologize'—a quirk that mirrors deeper spelling differences like 'colour' vs 'color,' preserving British connections to French and Latin.
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