Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

rhizobium

play
noun rhi·zo·bi·um \rī-ˈzō-bē-əm\

Definition of rhizobium

plural -bia \-bē-ə\

  1. :  any of a genus (Rhizobium) of small heterotrophic soil bacteria capable of forming symbiotic nodules on the roots of leguminous plants and of there becoming bacteroids that fix atmospheric nitrogen

rhi·zo·bi·al play \-bē-əl\ adjective


Origin of rhizobium

New Latin, from rhiz- + Greek bios life — more at quick


First Known Use: 1921


Medical Dictionary

rhizobium

play
noun rhi·zo·bi·um \rī-ˈzō-bē-əm\

Medical Definition of rhizobium

  1. 1 capitalized :  a genus (family Rhizobiaceae) of small heterotrophic soil bacteria capable of forming symbiotic nodules on the roots of leguminous plants where they fix atmospheric nitrogen

  2. 2plural -bia \-bē-ə\play :  any bacterium of the genus Rhizobium




Learn More about rhizobium

  1. Medical Dictionary: Definition of "rhizobium"


Seen and Heard

What made you want to look up rhizobium? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 12, 2016

of, relating to, or suggestive of marble

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

196.5 pounds 16.96 pounds 2.2 pounds 100 pounds
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ