The Collaborative International Dictionary of English v.0.48:
Annwn \Annwn\ n. 1. (Welsh mythology) the other world; land of fairies. Syn: Annwfn. [WordNet 1.5]WordNet (r) 3.0 (2006):
Annwn n 1: (Welsh mythology) the other world; land of fairies [syn: Annwfn, Annwn]