Meaning of rhizobium

rhi•zo•bi•um

Pronunciation: (rī-zō'bē-um), [key]
— pl. -bi•a
  1. any of several rod-shaped bacteria of the genus Rhizobium, found as symbiotic nitrogen fixers in nodules on the roots of the bean, clover, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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