Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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cell membrane the semipermeable membrane that encloses the contents of a cell; plasma membrane.
membrane bone a bone that is formed in membranous tissue, rather than in cartilage.
mucous membrane a lubricating membrane that lines various surfaces or organs, as of the respiratory, digestive, and genitourinary tracts.
nictitating membrane a thin, transparent membrane that forms an inner eyelid on birds, reptiles, and some mammals, that can be closed to keep the eye clean and moist.
plasma membrane the thin, semipermeable membrane that encloses a plant or animal cell.
tympanic membrane a thin, oval-shaped membrane separating the middle ear from the external ear, which vibrates when struck by sound waves; eardrum.