n. The branch of chemistry that deals with the chemical composition of the Earth and other planets, and with the chemical processes that occur in the formation of rocks and minerals etc.
the GNU version of the Collaborative International Dictionary of English
n. The study of the chemical composition of, and of actual or possible chemical changes in, the crust of the earth.
The Century Dictionary and Cyclopedia
n. The chemical study of the earth, that is, the science of its chemical composition and of the chemical causes and effects of terrestrial processes.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the chemistry of the earth's crust
Word Usage
"With the later advent of accelerator mass spectrometry, this has become a useful tool in geochemistry, but our counting techniques were not sensitive enough to make the method work."