an enveloping or covering membrane or layer of body tissue
Latin = shirt; hence a covering.
A sheet-like layer of tissue.
a layer of cells of the promeristem portion of the shoot apical meristem located covering the corpus. These cells divide anticlinally (perpendicular to the local surface). Tunica contributes to the protoderm and to a lesser extent to the ground meristem.
An outer one- to four-cell layered region of the apical meristem, where cell division is anticlinal, i.e., perpendicular to the surface. See apical meristem.
a covering or coat around muscle or hollow viscera
Any layer of tissue or membrane that encloses a structure or organ in either an animal or plant.
Thin membranous or fibrous outer layer.