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noun, plural: macroorganisms

Any macroscopic organism.


Macroorganisms are large enough to be seen by an unaided eye. No optical instruments such as microscopes and lens are necessary to see them. For instance, macrobenthos such as crustaceans and mollusks in the sea floor and millipedes, snails and mites in soil.

Word origin: Gk makro-, comb. form of makrós long + organism > organ: Gk órganon implement, tool, bodily organ.

Compare: microorganism.
See also: organism.