[nahy-troj-uh-neys, -neyz, nahy-truh-juh-]
noun Biochemistry.
an enzyme complex that catalyzes the reduction of molecular nitrogen in the nitrogen-fixation process of bacteria.

1930–35; nitrogen + -ase Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

nitrogenase ni·trog·e·nase (nī-trŏj'ə-nās', -nāz', nī'trə-jə-)
An enzyme of certain bacteria that activates the conversion of nitrogen to ammonia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nitrogenase   (nī-trŏj'ə-nās', nī'trə-jə-)  Pronunciation Key 
An enzyme of nitrogen-fixing bacteria that catalyzes the conversion of nitrogen to ammonia.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
These microbes extract nitrogen from the air using an enzyme called, appropriately enough, nitrogenase.
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