What is "microaerophile"

n. an organism, especially an aerobic bacterium, that lives and thrives in environments low in oxygen

A microaerophile is a microorganism that requires oxygen to survive, but requires environments containing lower levels of oxygen than are present in the atmosphere (i.e. <21% O; typically 2-10% O). Many microaerophiles are also capnophiles, requiring an elevated concentration of carbon dioxide (e.g. 10% CO in the case of Campylobacter spp.).