[{"Bold_text": "noun", "List Items": ["Botany.the lower part of the axis of an embryo; the primary root.a rudimentary root; radicel or rootlet.", "the lower part of the axis of an embryo; the primary root.", "a rudimentary root; radicel or rootlet.", "Chemistry.(formerly) radical(def15) radical(def15).", "Anatomy.a small rootlike part or structure, as the beginning of a nerve or vein."]}]