Radical What does the radical 石 mean? The radical 石 means stone; it has 5 strokes. Quick factsMeaningstoneStrokes5Kanji using it21 石5 strokes21 kanjistoneStroke order · 5 strokesWatch it written12345Kanji using this radical研sharpen破break確certainty岩rock砂sand硬hard磨polishing拓reclaiming砕smashing砲gun硝saltpeter硫sulfur碁go (board game)碑stone monument碧deep blue-green碩great磁magnet磯rocky shore礁reef礎foundation stone妬jealousy (romantic)