hormogonium

noun

hor·​mo·​go·​ni·​um ˌhȯr-mə-ˈgō-nē-əm 

plural hormogonia ˌhȯr-mə-ˈgō-nē-ə 

: a portion of a filament in many cyanobacteria that becomes detached as a reproductive body

Word History

Etymology

New Latin, from Greek hormos chain, necklace + New Latin -gonium — more at series

First Known Use

1880, in the meaning defined above