Mass in an Artery or Vein Caused by Coagulation
Puzzle 13 of Antarctica Medium Pack
Question is: Mass in an Artery or Vein Caused by Coagulation
and the answer is: BLOODCLOT
Word Meaning:
BLOOD CLOT — (hematology, pathology) A clot formed from platelets and other elements; that forms in a blood vessel in a living organism, and causes thrombosis or obstruction of the vessel at its point of formation or travel to other areas of the body.
Definitions from Wiktionary.