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hal·o·bacterium | \ -lə- \
Definition of halobacterium
1 capitalized : a genus of halophilic rod or disk-shaped gram-negative aerobic primitive bacteria (family Halobacteriaceae) that live in strongly saline pools in red to orange colonies and that at low oxygen levels synthesize the purple-pigmented protein bacteriorhodopsin
2 : a bacterium of the genus Halobacterium
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