GNU Collaborative International Dictionary of English

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Found one definition

1.       
   halobacter, halobacterium n.; pl. halobacteria (?), or  halobacters (#). Any halophilic bacterium of the archaebacteria group, expecially of the genera Halobacterium and Halococcus, which live in saline environments such as the Dead Sea or salt flats.
   
   Syn. -- halobacteria, halobacter.
   
   [WordNet 1.5 +PJC]