名詞 indo-european:

1. a member of the prehistoric people who spoke Proto-Indo European
   同義詞：Aryan
2. the family of languages that by 1000 BC were spoken throughout Europe and in parts of southwestern and southern Asia
   同義詞：Indo-European language, Indo-Hittite

形容詞 indo-european:

1. of or relating to the Indo-European language family
   同義詞：Indo-Germanic
2. of or relating to the former Indo-European people
   同義詞：Indo-Aryan, Aryan

In.do-Eu.ro.pe.an

n.（名詞）

A family of languages consisting of most of the languages of Europe as well as those of Iran, the Indian subcontinent, and other parts of Asia.
印歐語系：包括歐洲的大部分語言和伊朗、印度次大陸及亞洲其它一些地區(qū)使用的語言在內(nèi)的一個語系
Proto-Indo-European.Also called Indo-Germanic
原始印歐語也作 Indo-Germanic
A member of any of the peoples speaking an Indo-European language.
說印歐語的人：任何一支使用印歐語系語言的人種的成員

【引伸】
In.do-Eu.rope.an
adj.（形容詞）