The word is knaidel. That's the word 13-year-old Arvind Mahankali had to spell to become the champion at this year's Scripps Howard National Spelling Bee in Washington, DC.

According to Dictionary.com, a Knaidel is a Jewish dumpling. Here's the full definition of Knaidel:

nai·del [kneyd-l] Show IPA
noun, plural knai·dlach [kneyd-luhkh, -lahkh] Show IPA . Jewish Cookery.
a dumpling, especially a small ball of matzo meal, eggs, and salt, often mixed with another foodstuff, as ground almonds or grated potato, usually served in soup.

Mahankali took home $30,000 in cash and prizes just for winning the Scripps Howard National Spelling Bee.