海王星外天体 かいおうせいがいてんたい Meanings Noun trans-Neptunian object; transneptunian object; TNO Kanji 海 sea. Read as カイ. 王 king. Read as オウ. 星 star. Read as セイ. 外 outside. Read as ガイ. 天 heaven. Read as テン. 体 body. Read as タイ. Word lists Astronomy Jinuma: Japanese Dictionary · Word lists