词根词缀：radio-, radi-, rad-

【来源及含义】Latin: ray, radiating [the Latin word for the spokes of a wheel is radius]; spoke, staff, rod

【同源单词】involuntary euthanasia, irradiance, irradiant, irradiate, radial, radian

词根词缀：thanato-, thanat-, thanas-, -thanasia, -thanasic, -thanatous

【来源及含义】Greek: death, dead

【相关词根词缀】 Related "death, dead; kill" units: -cide; lethal-; mort-; neci-; phono-; necro-.

【同源单词】active euthanasia, aneuthanasia, apothanasia, athanasia, biothanatos, cacothanasia