afanc (n.) Look up afanc at Dictionary.com
cattle-devouring aquatic monster in Celtic countries, from Celtic *abankos "water-creature," from *ab- "water" (source also of Welsh afon, Breton aven "river," Latin amnis "stream, river," which is believed to be of Italo-Celtic origin), from PIE root *ap- (2) "water" (see water (n.1)).