kȯrˈmidēəm noun
( plural cormid·ia -ēə)
Etymology: New Latin, from Greek kormos tree trunk + New Latin -idium
: the entire body or colony of a compound animal ; sometimes : one of the clusters of zooids usually consisting of a helmet-shaped bract, a gastrozooid, and one or more gonophores often functioning as swimming bells and arising from the main stem of a calycophoran — used chiefly of the Siphonophora