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Entry 1 sense Webster, 1913

geochemistry

/(jē`ō̇*kĕm"ĭs*try̆)/ · ge·o·chem·is·try · IPA /dʒˌiːoʊkˈɛməstriː/
01 n. The study of the chemical composition of, and of actual or possible chemical changes in, the crust of the earth.
  1. 1.
    The study of the chemical composition of, and of actual or possible chemical changes in, the crust of the earth.