rhizobium[rī zō′bē əm]
rhizobium definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
noun pl. rhizobia
any of a genus (Rhizobium) of rod-shaped, nitrogen-fixing bacteria found in nodules on the roots of certain leguminous plants, as the bean and clover
Origin: Modern Latin ; from rhizo- plush Classical Greek bios, life: see bio-
rhizobium definition by American Heritage Dictionary
noun pl. rhi·zo·bi·a
Any of various nitrogen-fixing bacteria of the genus Rhizobium that form nodules on the roots of leguminous plants, such as clover and beans.
Origin: New Latin Rhizobium, genus name : rhizo- + Greek bios, life; see gwei- in Indo-European roots.