chemotroph

This term is used exclusively within scientific and academic registers, specifically in microbiology and biochemistry. It describes a metabolic strategy based on chemical energy, distinguishing these organisms from phototrophs, which utilize light. The term is neutral in connotation but highly technical, typically appearing in textbooks, research papers, and laboratory reports.

Because it refers to a biological classification of organisms, it follows standard English countability rules for species or types of organisms. It is often paired with adjectives like "obligate" or "facultative" to specify whether the organism is restricted to this energy source or can switch between different metabolic pathways.