MICROORGANISM

noun
20 Scrabble
25 WWF
M 3
I 1
C 3
R 1
O 1
O 1
R 1
G 2
A 1
N 1
I 1
S 1
M 3

Definition

An organism that is too small to be seen by the unaided eye, especially a single-celled organism, such as a bacterium.

"The cud is then reswallowed and further digested by specialized microorganisms that live in the rumen."

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