• (a.) Situated under or inside a sheath or vaginal membrane; as, the subvaginal, or subdural, spaces about the optic nerve.
(sәb-vaj´ĭ-nәl) below the vagina. under a sheath.
Sub·vag'i·nal adjective (Anat.) Situated under or inside a sheath or vaginal membrane; as, the subvaginal , or subdural, spaces about the optic nerve. 
Type: Term Pronunciation: sŭb-vaj′i-năl Definitions: 1. Below the vagina. 2. On the inner side of any tubular membrane serving as a sheath.