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Meaning of rootball

root•ball

Pronunciation: (rt'bôl", root'-), [key]
— n.
  1. a roughly spherical aggregate of roots and soil that is transplanted with a plant, esp. a tree or shrub.
  2. the ball of soil and roots of a plant growing in a pot or other container.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.