Definitions

1. adjective

relating to or capable of surviving or thriving without oxygen

“The anaerobian bacteria in the swamp were responsible for breaking down plant matter.”

2. noun

an organism that lives and grows without oxygen

“Some types of anaerobians have been found deep within the Earth’s crust.”

3. noun

a person or animal that lives without breathing oxygen

“In the science fiction novel, the main character was a genetically engineered anaerobian.”