from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See exobiology.
from the GNU version of the Collaborative International Dictionary of English
- n. exobiology; -- not used technically.
from 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
astro- + biology (Wiktionary)