A type of white blood cell that contains visible granules (tiny structures) in its cytoplasm and fights infections by engulfing bacteria and pathogens.
From granulo- (relating to granules) plus -cyte (from Greek kytos meaning 'cell'). The term was coined in the late 19th century as microscopy improved and scientists could see the distinctive granules inside these cells.
Granulocytes are like tiny armed security guards patrolling your bloodstream—they're packed with chemical weapons in those granules that they can fire at invaders, making them one of your immune system's first responders.
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