原始惑星 げんしわくせい Meanings Noun protoplanet Kanji 原 original. Read as ゲン. 始 begin 惑 bewilder. Read as ワク. 星 star. Read as セイ. Words containing 原始惑星 原始惑星系円盤 (げんしわくせいけいえんばん) protoplanetary disk Word lists Astronomy Jinuma: Japanese Dictionary · Word lists