undulating membrane

noun
un·​du·​lat·​ing membrane | \ ˈən-jə-ˌlāt-iŋ-, ˈən-d(y)ə- How to pronounce undulating membrane (audio) \

Medical Definition of undulating membrane

: a vibratile cytoplasmic membrane:
a : a lateral expansion of the plasma membrane in some flagellates that is usually associated with a flagellum
b : a row of laterally fused long cilia associated in many ciliates with the oral structures

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