Vaginate is an uncommon word that refers to something that has a shape or structure resembling a sheath or vagina. When searching for synonyms, one might consider words such as sheathed, enveloped, enclosed, covered, wrapped, cocooned, or shrouded. These words convey a sense of protection or concealment, which is also a characteristic of the word vaginate. Other potential synonyms might include words such as cladded, clad, or armored, which refer to something that is covered with a protective layer or material. Whatever word is used, it should convey a sense of safety, protection, and concealment, as well as the unique shape or structure associated with the concept of vaginate.