a Japanese radish (Raphanus sativus var. longipinnatus) having a long, white root that is eaten raw or cooked
See daikon in American Heritage Dictionary 4
(dīˈkŏnˌ, -kən)
noun
A white radish (Raphanus sativus var. longipinnatus) of Japan, having a long root that is eaten raw, pickled, or cooked. Also called Chinese radish, Japanese radish, Oriental radish.