原始惑星系円盤 げんしわくせいけいえんばん Meanings Noun protoplanetary disk Kanji 原 original. Read as ゲン. 始 begin 惑 bewilder. Read as ワク. 星 star. Read as セイ. 系 system. Read as ケイ. 円 circle. Read as エン. 盤 game board. Read as バン. Word lists Astronomy Jinuma: Japanese Dictionary · Word lists