Turnip
来自Big Physics
mid 16th century: first element of unknown origin + neep.
wiktionary
From Middle English turnepe, probably from turn + Middle English nepe, from Old English nǣp, from Latin nāpus. [1] The component turn may be due to the round shape of the plant as though turned on a lathe, or because it must be turned and twisted to be harvested. Cognate to neep. See also parsnip.
etymonline
turnip (n.)
c. 1500, turnepe, probably from turn (from its shape, as though turned on a lathe) + Middle English nepe "turnip," from Old English næp, from Latin napus "turnip." The modern form of the word emerged late 18c.