おにやんまMeaningsNoun1. Siebold's dragonfly (Anotogaster sieboldii); jumbo dragonfly (Usually kana)Other spellings鬼蜻蜓おにやんま馬大頭おにやんまUsually written in kanaOther readingsオニヤンマKanji in other spellings鬼oni蜻dragonfly蜓dragonfly馬horse大large頭headPitch accentおにやんま