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anaerobe

an·aer·obe [ ánnə rb ] (plural an·aer·obes)


noun 
Definition:
 
organism not needing oxygen: a microorganism that does not require oxygen for metabolism

[Late 19th century. Back-formation < French anaérobie "living without air" < Greek an- "not" + French aéro- "air" + Greek bios "life"]
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