astrobiology

[as-troh-bahy-ol-uh-jee]
noun
(not in technical use) exobiology.

Origin:
1950–55; astro- + biology

astrobiological [as-troh-bi-uh-loj-i-kuhl] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
astrobiology (ˌæstrəʊbaɪˈɒlədʒɪ)
 
n
the branch of biology that investigates the possibility of life elsewhere in the universe

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
astrobiology   (ās'trō-bī-ŏl'ə-jē)  Pronunciation Key 
See exobiology.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

astrobiology

a multidisciplinary field dealing with the nature, existence, and search for extraterrestrial life (life beyond Earth). Astrobiology encompasses areas of biology, astronomy, and geology.

Learn more about astrobiology with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Astrobiology is a relatively new science concerned with the frequency and
  nature of life in the universe.
Read day-by-day accounts of the expedition and learn more about the emerging
  science of astrobiology.
That's what's fascinating to the astrobiology community.
While the answer to that question will have to wait, in the meantime you can
  bone up on the nascent field of astrobiology.
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