Dictionary/炉心ろしんRoshin炉心 (Roshin) is a Japanese noun meaning “nuclear reactor core”.Meaningsnounnuclear reactor coreKanji in 炉心炉hearth心heartRelated words心配worry心mind心heart安心peace of mind心臓heart心当たりhaving in mind心からfrom the bottom of one's heart中心center肝心essential熱心zealous決心determination本心true feelings