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Meaning of appressorium

ap•pres•so•ri•um

Pronunciation: (ap"re-sôr'ē-um, -sōr'-), [key]
— pl. -so•ri•a
  1. a flattened and thickened tip of a hyphal branch, formed by some parasitic fungi, that facilitates penetration of the host plant.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.