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|Noun||1.||trichodesmium - large colonial bacterium common in tropical open-ocean waters; important in carbon and nitrogen fixation|
blue-green algae, cyanobacteria - predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton
genus Trichodesmium - a genus of blue-green algae