In medical and biological terminology, referring to something that has two follicles, especially in the context of hair growth or reproductive structures.
From Latin 'bi-' (two) + 'folliculus' (small bag or sac). The term is used in dermatology and reproductive medicine to describe specific anatomical structures.
The bifollicular unit is why hair transplant surgery works—surgeons learned that moving two hairs together produces much more natural-looking results than single hairs because that's how hair naturally grows from skin.
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