In English the word is often used to refer to the vulva as well. Scientifically the vagina does not include the vulva or cervix, but in casual usage the word can often refer to all those parts. Klingon seems to also include all those parts in the word qey'Hav.
qey'Hav n. vagina
[refers to the entire thing, not only the exterior part]
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This clarification is confusing as the vagina is an interior body part.