n. The study of the chemical composition of stars and outer space
the GNU version of the Collaborative International Dictionary of English
n. the branch of science involving astronomy and chemistry which studies the chemical composition, chemical reactions, and evolution of matter in outer space.
The Century Dictionary and Cyclopedia
n. That part of astronomy which treats of what is known of the chemistry of the celestial bodies.
Word Usage
"A look at astrochemistry is really a look into our own origins as living beings on the planet Earth."