the.com/heparin

means An anticoagulant drug (and naturally occurring substance in the body) that blocks the clotting cascade, used to prevent and treat dangerous blood clots.

from Coined from the Greek 'hepar,' meaning liver — the organ it was first isolated from in the early 20th century, when researchers discovered a substance there that kept blood from clotting. It's since been found throughout the body, especially in mast cells, but the liver gave it its name.