from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Shaped like a turnip: napiform roots.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Shaped like a turnip; spherical at the top, but with a tapering bottom.
from the GNU version of the Collaborative International Dictionary of English
- adj. Turnip-shaped; large and round in the upper part, and very slender below.
from The Century Dictionary and Cyclopedia
- Having the shape of a turnip—that is, enlarged in the upper part and slender below: as, a napiform root.
Latin nāpus, turnip + -form.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin nāpus ("turnip") + -form (Wiktionary)