| 单词 | nitrogen cycle |
| 释义 | nitrogen /nīˈtrə-jən/nounA gaseous element (symbol N; atomic no 7) forming nearly four-fifths of common air, so called from its being an essential constituent of nitre ORIGIN: Gr nitron sodium carbonate (but taken as if meaning nitre), and the root of gennaein to generate nitrogenase /nī-trojˈə-nāz/ noun An enzyme complex that catalyses nitrogen fixation nitrogenizāˈtion or nitrogenisāˈtion noun nitrogenize or nitrogenise /-trojˈ/ transitive verb To combine or supply with nitrogen nitrogˈenous adjective Of or containing nitrogen nitrogen cycle noun The sum total of the transformations undergone by nitrogen and nitrogenous compounds in nature, circulating between the atmosphere, soil and living organisms, from free nitrogen back to free nitrogen nitrogen dioxide noun A poisonous gas (NO2) with a pungent smell nitrogen fixation noun The formation of compounds from free atmospheric nitrogen, either naturally (by lightning, ultraviolet radiation or the action of bacteria) or by an industrial process, eg to make fertilizers nitrogen monoxide same as nitric oxide (see under nitre). nitrogen mustard noun Any of several compounds with a molecular structure resembling that of a mustard gas, used in cancer treatments nitrogen narcosis noun The intoxicating and anaesthetic effect of too much nitrogen in the brain, experienced by divers at considerable depths (also called rapture of the deep or rapture of the depths and (slang) the narks) |
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