(n.) The root of a plant which penetrates the earth directly downward to a considerable depth without dividing.
Thesaurus Entries
beginning, bulb, bulbil, commencement, conception, corm, derivation, genesis, grass roots, head, inception, origin, original, origination, provenience, radical, radicle, radix, rhizome, rise, root, rootstock, source, stem, stock, tap, tuber, tubercle
