Definition of Jerusalem artichoke
: 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
From the M-W Editors
Origin and Etymology of jerusalem artichoke
Jerusalem by folk etymology from Italian girasole girasole
First Known Use: 1639
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Britannica.com: Encyclopedia article about Jerusalem artichoke
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