The American Heritage® Dictionary of the English Language, 4th Edition
n. The branch of biology that deals with the search for extraterrestrial life and the effects of extraterrestrial surroundings on living organisms. Also called astrobiology, space biology.
n. The branch of biology dealing with extraterrestrial lifeforms.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life
Word Usage
"Nog had remembered from horror-themed holonovels that aiming for the head and destroying the brain was the best way to deal with a zombie, but that was fiction, not in exobiology."