Webster's English Dictionary

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artichoke

ar.ti.choke \'a:rt-*-.cho-k\ n [It dial. articiocco, fr. Ar al-khurshu-f 
   the artichoke] 1: a tall composite herb (Cynara scolymus) like a thistle 
   with coarse  pinnately incised leaves; also : its edible flower head which 
   is cooked as a vegetable 2: JERUSALEM ARTICHOKE