angiocyst

A small vesicular aggregation of embryonic mesodermal cells that may give rise to vascular endothelium and blood cells.

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an·gio·cyst 'an-jē-ə-.sist n a pouch of mesothelial tissue having blood-forming properties

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an·gio·cyst (anґje-o-sist″) [angio- + cyst] angioblastic cyst.