1. Microorganisms, typically archaea, that produce methane as a metabolic byproduct, often found in anaerobic environments such as swamps, landfills, and the digestive systems of animals.
Usage: plural form of methanogen; technical/scientific term; commonly used in microbiology, environmental science, and biotechnology

Examples

• Methanogens in cow stomachs produce methane, which contributes to greenhouse gas emissions.
• Scientists study methanogens to understand how they break down organic matter in wetlands.
• Methanogens are essential microorganisms in anaerobic digesters used to generate biogas.
• The presence of methanogens in landfills can be harnessed to produce renewable energy.
• Methanogens thrive in oxygen-free environments where other microorganisms cannot survive.