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Like some other words for parts of the body, this word was adopted from Latin. In addition to meaning vagina, in Latin it also refers to a sheath--a case for a knife. Probably those two things were see as similar because they are tube-shaped, and a thing (a knife in the one case and a penis in the other) can be inserted.

Note that while we sometimes use the word "vagina" to refer to the whole genital region of the female body, technically the vagina is an internal organ. The vulva is the part at the surface.

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15y ago

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