methanogen

CIDE DICTIONARY

methanogen, n. 

 A type of archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage, and capable of producing methane; a source of natural gas.  [WordNet 1.5]

ROGET THESAURUS

methanogen

Life

N life, vitality, viability, animation, vital spark, vital flame, soul, spirit, respiration, wind, breath of life, breath of one's nostrils, oxygen, air, respirator, artificial respirator, heart and lung machine, iron lung, medical devices, lifeblood, Archeus, existence, vivification, vital force, vitalization, revivification, Prometheus, life to come, physiology, biology, animal ecology, nourishment, staff of life, genetics, heredity, inheritance, evolution, natural selection, reproduction (production), microbe, aerobe, anaerobe, facultative anaerobe, obligate aerobe, obligate anaerobe, halophile, methanogen, archaebacteria, microaerophile, animal, vegetable, artificial life, robot, robotics, artificial intelligence, breathing, breathing rate, heartbeat, pulse, temperature, preservation of life, healing (medicine), living, alive, in life, in the flesh, in the land of the living, on this side of the grave, above ground, breathing, quick, animated, animative, lively, all alive and kicking, tenacious of life, full of life, yeasty, vital, vitalic, vivifying, vivified viable, zoetic, Promethean, vivendi causa, atqui vivere militare est, non est vivere sed valere vita.