Vagina \Va*gi"na\, n.; pl. Vagin[ae]. [L. vagina a scabbard or sheath.]

1. (Anat.)
   (a) A sheath; a theca; as, the vagina of the portal vein.
   (b) Specifically, the canal which leads from the uterus to the external orifice if the genital canal, or to the cloaca.

2. (Zo["o]l.) The terminal part of the oviduct in insects and various other invertebrates. See Illust., of Spermatheca.

3. (Bot.) The basal expansion of certain leaves, which inwraps the stem; a sheath.

4. (Arch.) The shaft of a terminus, from which the bust of figure seems to issue or arise.

Source: Webster's Revised Unabridged Dictionary (1913)