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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The main root of a plant, usually stouter than the lateral roots and growing straight downward from the stem.

from the GNU version of the Collaborative International Dictionary of English

  • n. The root of a plant which penetrates the earth directly downward to a considerable depth without dividing.

from The Century Dictionary and Cyclopedia

  • n. In botany, the main root of a plant, which grows vigorously downward to a considerable depth, giving off lateral roots in acropetal succession. See cut under root.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. something that provides an important central source for growth or development
  • n. (botany) main root of a plant growing straight downward from the stem


tap + root (Wiktionary)



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