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annual ring one of the concentric rings of wood visible in a cross section of a tree representing the layer of growth from one year.
blastula an embryo in an early stage of development that consists of a single layer of cells forming a hollow sphere.
blubber the layer of fat beneath the skin of whales, seals, and other large sea mammals. [1/5 definitions]
club sandwich a sandwich of three or more layers of bread, often toasted, that is filled with layers of meat, cheese, tomato, mayonnaise, and the like.
corium the layer of skin that lies beneath the epidermal layer and contains nerves and blood vessels; derma.
cortex the layer of the bark or stem of a tree or plant that lies between the vascular tissue and the epidermis. [1/3 definitions]
denude in geology, to lay (rock) bare by eroding the layer of soil that covers it. [1/2 definitions]
epidermis the outer, nonsensitive layer of skin. [2 definitions]
epilimnion the layer of the water of a lake, above the thermocline, that is warmest and contains the most oxygen. (Cf. hypolimnion.)
epitaxy the growth of a crystalline layer on an existing crystal that guides its development.
epithelium a protective, membranous layer of tissue, usu. a single layer of close-knit cells, that lines the cavities and the outside of an organism.
exogenous in botany, of or pertaining to a process of growing in diameter by addition of successive layers under the bark; cambial. [1/2 definitions]
foliaceous laminated in thin leaflike layers, as certain rocks. [1/3 definitions]
gastrula an embryo in an early stage of development consisting of two saclike layers of cells that enclose a central cavity.
Heaviside layer see "E layer."
hypodermic pertaining to the layer of tissue beneath the skin. [1/4 definitions]
hypolimnion the layer of the water of a lake, below the thermocline, that is coldest and contains the least oxygen. (Cf. epilimnion.)
layer cake a cake made in two or more layers that are separated by icing, preserves, or the like.
mantle the layer of the earth that lies between the crust and the core. [1/9 definitions]
media2 the middle layer of an arterial or lymphatic duct.
membrane a thin, flexible, tensile layer of tissue that separates, connects, lines, or covers various structures, such as organs, in living organisms. [1/2 definitions]