corpus cardiacum
noun
corpus car·di·a·cum
-kär-ˈdī-ə-kəm
plural corpora cardiaca
-kär-ˈdī-ə-kə
: one of a pair of separate or fused bodies of nervous tissue in many insects that lie posterior to the brain and function in the storage and secretion of brain hormone
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Merriam-Webster unabridged
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