anaerobe

n.
An organism, such as a bacterium, that can live in the absence of atmospheric oxygen.

anaerobic an'aer·o'bic (ăn'ə-rō'bĭk, -âr-ō'bĭk) adj.
anaerobically an'aer·o'bi·cal·ly adv.

Micro-organisms that grow in the absence of oxygen. Obligate anaerobes cannot survive in the presence of oxygen, facultative anaerobes normally grow in the presence of oxygen but can also grow in its absence.

(an′ərōb)
n

A microorganism that can exist and grow only in the partial or complete absence of molecular oxygen.

An organism that lives and grows in the absence of molecular oxygen.

• facultative a. — a microorganism that can grow with or without molecular oxygen.
• obligate a. — an organism that can grow only in the complete absence of molecular oxygen.

An organism that can live without oxygen. Many fungi and bacteria are anaerobic.