| 单词 | methanogen |
| 释义 | methanogen in American English (məˈθænədʒən; məˈθænəˌdʒɛn) noun an anaerobic microorganism that lives on carbon dioxide and hydrogen and gives off methane, found in swamp sediment, cows' stomachs, etc. Derived forms methanogenic (meˌthanoˈgenic) (məˈθænəˈdʒɛnɪk) adjective methanogen in American English (meˈθænədʒən, -ˌdʒen) noun any of a diverse group of widely distributed archaebacteria that occur in anaerobic environments, as the intestinal tracts of animals, freshwater and marine sediments, and sewage, and are capable of producing methane from a limited number of substrates, including carbon dioxide and hydrogen, acetate, and methylamines: an important source of natural gas Derived forms methanogenic adjective Word origin [1975–80; methane- + -o- + -gen]This word is first recorded in the period 1975–80. Other words that entered Englishat around the same time include: bench press, family therapy, gravitational lens, surrogate mother, videotex-o- is the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elementsof Greek origin and often used in English as a connective irrespective of etymology(Franco-Italian; geography; seriocomic; speedometer); -gen is a combining form meaning “that which produces,” used in the formation of compoundwords. Other words that use the affix -gen include: endogen, hydrogenExamples of 'methanogen' in a sentence |
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