noun a sheath; a theca; as, the vagina of the portal vein.
2. vagina ·noun the basal expansion of certain leaves, which inwraps the stem; a sheath.
3. vagina ·noun the shaft of a terminus, from which the bust of figure seems to issue or arise.
4. vagina ·noun the terminal part of the oviduct in insects and various other invertebrates. ·see illust., of spermatheca.
5. vagina ·noun specifically, the canal which leads from the uterus to the external orifice if the genital canal, or to the cloaca.