noun
a small cavity, sac, or gland, in particular, a hair follicle, from which a hair grows
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The follicle is a structure within the skin that contains the root of a hair.
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I have a stubborn follicle that just won't come out when I pluck my eyebrows.
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That follicle is being a real pain in the butt.
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The follicle of creativity in her mind was bursting with new ideas.