Jerusalem artichoke
noun
Je·ru·sa·lem artichoke
jə-ˈrü-s(ə-)ləm-
-ˈrüz-ləm-,
-ˈrü-zə-
: a perennial sunflower (Helianthus tuberosus) of the U.S. and Canada widely cultivated for its tubers that are used as a vegetable and as a livestock feed
also
: its tubers
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Merriam-Webster unabridged
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