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valve	an anatomical structure, such as a membranous flap, that controls the flow of a body fluid or keeps it flowing in only one direction. [1/5 definitions]
velum	a thin, veillike membrane or membranous covering or partition, esp. the soft palate.
vocal cords	either of two pairs of membranous folds in the larynx, the lower of which vibrates when air passes over it, thus producing vocal sounds.
yolk sac	a membranous sac that nourishes the embryos of primitive mammals, bony fishes, sharks, reptiles, and birds. [1/2 definitions]

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