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rhizobium

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WordReference Random House Unabridged Dictionary of American English © 2026

rhi•zo•bi•um n., pl. -bi•a [Bacteriol.]

Microbiologyany of several rod-shaped bacteria of the genus Rhizobium, found as symbiotic nitrogen fixers in nodules on the roots of the bean, clover, etc.

Neo-Latin (1889), equivalent. to rhizo- rhizo- + Greek bí(os) life (see bio-) + Latin -um noun, nominal suffix

'rhizobium' also found in these entries (note: many are not synonyms or translations):

nitrogen fixation - root nodule

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