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Meaning of horned oak gall

horned' oak' gall"

Pronunciation: [key]
  1. a small, round tumor, formed around wasp eggs laid in the branches of a pin oak tree, that disrupts the flow of nutrients to the tree, with consequent defoliation and death. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.