trio n. (pl. trios) 三人(一组),三人演出小组;三个一套;【几】拼三小组;【音乐】三重奏[唱];三部合奏[唱]曲;进行曲的中央乐部;(piquet 牌戏) king, queen, jack, ace 各三张的一付牌。 the scenic trio of Shanghai 上海三景。
A string trio is a group of three string instruments or a piece written for such a group. The term is generally used with reference to works of chamber music from the Classical period to the present.