A single organism that lives and thrives in air, or a bacterium that requires oxygen; essentially synonymous with aerobe.
From aero- (air) + -bion (Greek for living creature); a less common variant of 'aerobe,' more typical of older or European scientific literature.
This is the singular form you'll find in dusty old German microbiology textbooks — it's extremely formal and sounds almost like it belongs in a fantasy novel, which is probably why modern scientists switched to the simpler 'aerobe.'
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