Bacterium requiring oxygen, e.g

• Entity needing oxygen
•     Sound of a willow in the wind
• Bacterium requiring oxygen
• Oxygen-thriving organism
• Bacteria requiring oxygen
• Listeria bacterium, for one
• Oxygen-dependent creature
• Organism needing air to exist
• Microscopic oxygen user

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Aerobe \Aer"*obe\, n. [See aerobies .] an organism such as a microorganism that requires oxygen for life or growth.