天てん然ねん放ほう射しゃ性せい同どう位い体たいMeaningsNoun1. natural radioisotopeKanji used天heaven然sort of thing放release射shoot性nature (of a person)同same位rank体bodyComposed of天てん然ねんnature; spontaneityNoun放ほう射しゃ性せいradioactiveNoun同どう位いthe same rank; the same digitNoun体たいbody; physique; posture; shape; form; style; substance; identity; reality; field; …Noun