鞘, 阴道

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.