acidophile

This term is primarily used within specialized scientific registers, specifically in microbiology, geology, and astrobiology. It describes a biological adaptation rather than a general preference, implying that the organism not only tolerates but requires acidic conditions for optimal growth and metabolic function.

In a taxonomic context, acidophiles are often contrasted with alkaliphiles (which prefer basic environments) and neutrophiles (which prefer neutral pH). The term is typically used as a technical classification to describe extremophiles found in environments like volcanic vents or acid mine drainage.