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From The Collaborative International Dictionary of English v.0.48:
Vagina \Va*gi"na\, n.; pl. Vaginae. [L. vagina a scabbard or sheath.] [1913 Webster] 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 of the genital canal, or to the cloaca. [1913 Webster] 2. (Zool.) The terminal part of the oviduct in insects and various other invertebrates. See Illust., of Spermatheca. [1913 Webster] 3. (Bot.) The basal expansion of certain leaves, which inwraps the stem; a sheath. [1913 Webster] 4. (Arch.) The shaft of a terminus, from which the bust or figure seems to issue or arise. [1913 Webster]