the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [adjective] > of class Hydrozoa > of colonial hydrozoan > relating to hydroecium
hydrœcial1858
1858 T. H. HuxleyOceanic Hydrozoa 39 The lateral walls of the hydrœcial canal of the distal nectocalyx.