mucous membrane

membrane in the body that secretes lubricating material

The mucous membranes (or mucosae; singular: mucosa) are linings of mostly endodermal origin, covered in epithelium, and are involved in absorption and secretion. They line various body cavities that are exposed to the external environment and internal organs. It is at several places continuous with skin: at the nostrils, the lips, the ears, the genital area, and the anus. The sticky, thick fluid secreted by the mucous membranes and gland is termed mucus. The term mucous membrane refers to where they are found in the body and not every mucous membrane secretes mucus.
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Mucous membrane n. A membrane lining all body passages that communicate with the exterior, such as the respiratory, genitourinary, and alimentary [more]Mucous membrane - Community and Resources

Noun
1. mucus-secreting membrane lining all body cavities or passages that communicate with the exterior
(synonym) mucosa
(hypernym) membrane, tissue layer
(hyponym) conjunctiva

[MYOO-kus]
The moist tissue that lines some organs and body cavities (such as the nose, mouth, lungs) and makes mucus (a thick, slippery fluid). Also called mucosa.