スダジイすだじいMeanings1nounCastanopsis sieboldii (species of chinquapin)usually written using kana aloneA species of evergreen tree in the beech family, native to Japan and parts of East Asia. The name is usually written in katakana.スダジイは日本にほんの照しょう葉よう樹じゅ林りんを代だい表ひょうする樹じゅ種しゅの一ひとつです。