|1.||anatomy tissue forming a layer or covering of an organ or part, such as any of the tissue layers of a blood vessel wall|
|2.||botany Compare corpus the outer layer or layers of cells of the meristem at a shoot tip, which produces the epidermis and cells beneath it|
|[C17: from Latin tunica|
tunica tu·ni·ca (tōō'nĭ-kə, tyōō'-)
n. pl. tu·ni·cae (-kē', -sē')
An enclosing or enveloping membrane or layer of tissues, as of a blood vessel or other tubular structure.