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Meaning of overstory

o•ver•sto•ry

Pronunciation: (ō'vur-stôr"ē, -stōr"ē), [key]
— pl. -ries.
  1. the uppermost layer of foliage in a forest, forming the canopy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.