Tiny sac-like structures in skin that produce hair, or small pouches in plants that contain seeds.
From Latin 'folliculus' meaning 'small bag or sack.' Used scientifically since the 17th century to describe the microscopic structures we see under a microscope.
Your hair follicles are basically tiny factories that never stop producing hair—they go through cycles of growing and resting, which is why you're constantly losing hair (about 50-100 a day is normal) but your head stays full!
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