炉ろ心しんろしんCommon wordFreq.FrequencyTop 50,000Meanings1nounnuclear reactor coreTechnical term for the central part of a nuclear reactor where the nuclear reaction takes place.事じ故こで炉ろ心しんが損そん傷しょうした。The reactor core was damaged in the accident.炉ろ心しんの温おん度どが上じょう昇しょうしている。The temperature of the reactor core is rising.