n. In anatomy, the cuticle or scarfskin; the non-vascular outer layer of the skin.n. In zoology, broadly, some or any outermost integument or tegumentary covering or envelop of the body, or some part of the body: a term nearly synonymous with exoskeleton.n. In embryology, the outermost blastodermic membrane; the ectoderm or epiblast, which will in due course become an epidermis proper.n. In conchology, specifically, the rind or peel covering the shell of a mollusk; the external animal integument of the shell, as distinguished from the shell-substance proper: commonly found as a tough, fibrous, or stringy dark-colored bark, which readily peels off in shreds.n. In botany, the outer layer or layers of cells covering the surfaces of plants.n. Also epiderm.