To coagulate together; to cause to clot or thicken as a mass together.
From Latin con- (together) + coagulate (from coagulare, to curdle). Meaning evolved from physical merging of substances to figurative joining together.
Blood banks depend on understanding concoagulation—when blood components clump together, it can save lives in transfusions, but when proteins concoagulate in disease, it becomes dangerous.
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