Definitions for taprootˈtæpˌrut, -ˌrʊt
Random House Webster's College Dictionary
a main root descending downward and giving off small lateral roots.
Origin of taproot:
(botany) main root of a plant growing straight downward from the stem
something that provides an important central source for growth or development
"the taproot of his resentment"; "genius and insanity spring from the same taproot"
A long tapering root possessed by many plants (such as carrots and dandelions).
Origin: tap + root
the root of a plant which penetrates the earth directly downward to a considerable depth without dividing