hor·mo·go·ni·um | \ ˌhȯr-mə-ˈgō-nē-əm 
\
\ plural hormogonia\ ˌhȯr-mə-ˈgō-nē-ə \
\Definition of hormogonium
: a portion of a filament in many cyanobacteria that becomes detached as a reproductive body
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The first known use of hormogonium was in 1880
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