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follicle
In animals, a small cavity in the body. One example is a hair follicle, a pit on the surface of the skin from which a hair grows. Another example is an ovarian follicle, one of the many fluid-filled cavities in the ovaries in which an ovum (egg) develops.
In plants, a follicle is a dry single-seeded fruit that splits along one margin only to liberate the seeds, e.g., larkspurs, columbine. See also legume.
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