- cormidium
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n.; pl. cormidia [Gr. dim. kormos, trunk of a tree](CNIDARIA: Hydrozoa)A siphonophore gastrozooid with a tentacle and one or more gonophores of one sex; sensu stricto, cormidia are colonies within colonies; see eudoxome.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.