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lamellipodium

(lə-mĕl′ə-pōdē-əm)
n. pl. la•mel•li•po•di•a (-dē-ə)
  1. A sheetlike cytoplasmic extension produced by migrating polymorphonuclear white blood cells that permits movement along a substrate.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.