conlang
noun [ C or U ] uk/ˈkɒn.læŋ/ us/ˈkɑːn.læŋ/
(为书、电影或电视剧等创造的)虚构语言,人造语言
an artificial language, for example one invented for a film, TV series, or book
He is a conlang expert, who invented Dothraki for "Game of Thrones". 他是一位人造语言专家,为《权力的游戏》虚构了多斯拉克语。