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undulating membrane

(ŭnjə-lā′tĭng, -də-)
n.
  1. An organelle of locomotion in certain flagellate parasites consisting of a finlike extension of the cytoplasmic membrane with the flagellar sheath.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.