Jerusalem artichoke - definition and synonyms

noun [countable/uncountable] 

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/dʒəˌruːsələm ˈɑː(r)tɪˌtʃəʊk/
singularJerusalem artichoke
pluralJerusalem artichokes
  1. a vegetable with a very pale brown skin and white flesh. It grows under the ground.