from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun 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 the GNU version of the Collaborative International Dictionary of English.

  • noun (Bot.) The root of a plant which penetrates the earth directly downward to a considerable depth without dividing.

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

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


from Wiktionary, Creative Commons Attribution/Share-Alike License

tap + root



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