ru·cu·yen noun alsoroo·coo·yenorrou·cou·yenne\|rüˌkü|yen\ (pluralrucuyenorrucuyens) Usage: usually capitalized 1. a.: a Cariban people of the Tumuc-Humac mountains between Brazil and the Guianas b.: a member of such people 2.: a language of the Rucuyen people