Exobiology Definition
 ĕksō-bī-ŏlə-jē 
    noun
  
 The branch of biology investigating the possibility of extraterrestrial life and the effects of extraterrestrial environments on living organisms from the earth.
 Webster's New World 
Synonyms: 
  Origin of Exobiology
-  
exo- + biology
From Wiktionary
 
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