孫太郎虫 まごたろうむし Meanings Noun hellgrammite (larva of dobsonfly species Protohermes grandis) See also: ヘビトンボ. Kanji 孫 grandchild. Read as まご. 太 thick 郎 son. Read as ロウ. 虫 insect. Read as むし. Word lists Colloquial Jinuma: Japanese Dictionary · Word lists