When liquid starts to thicken and become solid, it coagulates. When you get a cut, the blood flowing from the wound will coagulate: it will start to clot and form a solid scab so you will stop bleeding.

Many liquids have the potential to coagulate. If the cream you just poured into your coffee is spoiled, you'll see the cream coagulate as it curdles into little floating chunks. If someone has a heart condition that may result in a heart attack, he or she might take medication that keeps the blood in the arteries from coagulating, or dangerously thickening.

Definitions of coagulate
  1. verb
    change from a liquid to a thickened or solid state
    coagulated blood”
    synonyms: clot
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    turn from a liquid to a solid mass
    type of:
    change state, turn
    undergo a transformation or a change of position or action
  2. verb
    cause to change from a liquid to a solid or thickened state
    synonyms: clot
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    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  3. adjective
    transformed from a liquid into a soft semisolid or solid mass
    synonyms: coagulated, curdled, grumose, grumous
    relatively dense in consistency
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