[{"Bold_text": "noun", "List Items": ["Wil·helm Kon·rad[wil, -helm , kon, -rad, vil, -helm , kawn, -, r, aht], 1845–1923, German physicist: discoverer of x-rays 1895; Nobel Prize 1901.", "(lowercase)Physics.a unit of exposure dose that measures x-rays or gamma rays in terms of the ions or electrons produced in dry air at 0° C and one atmosphere, equal to the amount of radiation producing one electrostatic unit of positive or negative charge per cubic centimeter of air. : r, R"]}, {"Bold_text": "adjective", "List Items": ["(sometimes lowercase)of or relating to Wilhelm Roentgen, the Roentgen unit, or especially to x-rays."]}]