vagina
膣 refers specifically to the vagina, a part of the female reproductive system.
膣 combines the flesh radical ⺼ with 窒, which likely contributes the sound チツ. The character was created to represent a specific body part.
The flesh radical ⺼ indicates a body part, and the right side 窒 (which can mean 'block' or 'obstruct') suggests a passage or cavity. Together they point to the vagina.
For チツ, imagine a medical chart where the vagina is labeled with the sound 'cheats' (チツ), as if the body part is 'cheating' by being hidden. Cheats -> チツ.
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vagina
candidal vaginitis; vaginal yeast infection
vaginal trichomoniasis
rectovaginal
rectovaginal fistula
bacterial vaginosis; BV
transvaginal
vaginal delivery
vaginal cancer
vaginal yeast infection; thrush; candidiasis
vaginal trichomoniasis
queef
intravaginal
intravaginal ejaculation
vaginal secretion (during arousal); vaginal lubricant
vaginal vestibule; vulvar vestibule
vaginal opening
vaginal tightness; vaginal pressure
vaginal smear
vaginal wall