milliroentgenWiktionary 原文英美构词拆解millimilli-前缀roentgenroentgen词干milli-In the International System of Units and other metric systems of units, one-thousandth of the unit to which it is prefixed; that is, multiplying the unit to which it is attached by 10-3. Symbol: m. · thousand词源说明From milli- + roentgen.释义名词noun1A unit of exposure to ionizing radiation, one thousandth of a roentgen.