"Sheath-like" is a term that refers to something that is narrow and tubular in shape, similar to a sheath. There are a number of synonyms for this word that have similar meanings, including tubular, cylindrical, encasing, wrapping, protective, and sleevelike. Other related words include envelope-like, casing, covering, and shrouding. These terms are often used to describe objects or structures that are elongated in shape and provide a protective layer around something else. Whether used to describe a protective covering for a new piece of equipment or the shape of a building, these words can add clarity and precision to any description.