hor·mo·go·ni·um (hôr'mə-gō'nē-əm) n.
pl.hor·mo·go·ni·a (-nē-ə) A part of a filament of a cyanobacterium that detaches and grows by cell division into a new filament.
[New Latin : Greek hormos, chain, necklace; see ser-2 in Indo-European roots + Greek gonos, seed; see genə- in Indo-European roots.]