cor·mid·i·um
| \ kȯrˈmidēəm \
plural cormidia\
-ēə
\
Definition of cormidium
: 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
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Merriam-Webster unabridged
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