DICT.TW Dictionary Taiwan

 tap·root /-ˌrut, ˌrʊt/
 主根,直根

 Tap·root n. Bot. The root of a plant which penetrates the earth directly downward to a considerable depth without dividing.
 ◄ ►

 taproot
      n 1: (botany) main root of a plant growing straight downward from
           the stem
      2: something that provides an important central source for
         growth or development; "the taproot of his resentment";
         "genius and insanity spring from the same taproot"