Emily Dickinson Lexicon

GE-OL'O-GY, n. [Gr. γη, the earth, and λογος, discourse.]

The doctrine or science of the structure of the earth or terraqueous globe, and of the substances which compose it; or the science of the compound minerals or aggregate substances which compose the earth, the relations which the several constituent masses bear to each other, their formation, structure, position and direction: it extends also to the various alterations and decompositions to which minerals are subject. Dict. Nat. Hist. Cleaveland.