lithotroph

This term is used exclusively within specialized scientific registers, specifically microbiology, geochemistry, and astrobiology. It describes a specific metabolic strategy where the organism derives energy from inorganic sources, such as hydrogen, sulfur, or iron, rather than from organic carbon sources like sugars.

In a taxonomic context, lithotrophs are often contrasted with organotrophs. Because this is a technical classification based on energy source, it is rarely encountered in general conversation and is typically found in academic papers or textbooks discussing extreme environments, such as deep-sea vents or subterranean rock formations.