noun.
The scientific study of the possible origin, distribution, evolution, and future of life in the universe, including that on Earth, using a combination of methods from biology, chemistry, and astronomy.
the GNU version of the Collaborative International Dictionary of English
noun.
exobiology; -- not used technically.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life
Word Usage
"It appears astrobiology is the funding source for the methane study, If you think this effort is worth funding please state so, I happen to think it was worth the effort if they are correct which is still open in my mind."