| ̷ ̷ ̷ ̷ˌ ̷ ̷| ̷ ̷ noun
: a unit in which the therapeutic dosage of radium is expressed and which consists in exposure to the action of one milligram of radium for one hour
| ̷ ̷ ̷ ̷ˌ ̷ ̷| ̷ ̷ noun
: a unit in which the therapeutic dosage of radium is expressed and which consists in exposure to the action of one milligram of radium for one hour
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012