#词种起源# Greek, παιδί, paidos, PED-. Child. 儿科pediatrics; 儿童牙科pedodontia; 恋童癖pedophile; 教学法pedagogy. 再拓：1-iatr- heal, psychiatry, podiatry; 2dont-, tooth, exodontics拔牙 periodontia牙周病学 endodontics牙髓学；3-phil-, love. Philanthropy; 4 agog-, demagogue
