Something or someone that causes clotting, or a substance that promotes the formation of clots.
From the verb 'clot' plus the agent suffix '-er' (Old English '-ere'), which creates a noun meaning 'one who does' or 'that which does' the action of the verb.
Blood clotters called platelets are tiny cell fragments that patrol your bloodstream like emergency responders, instantly rushing to seal any breach in your blood vessels!
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