Definition of Newfoundland 1. A breed of very large heavy dogs with a thick coarse usually black coat; highly intelligent dogs and vigorous swimmers; developed in Newfoundland Noun 2. An island in the north Atlantic Noun Synonyms for word "Newfoundland" Semanticaly linked words with "Newfoundland" Hyponims for word "Newfoundland" has derived form newfound etymology Newfoundlander etymologically related Newfie is derived from N. L. is derived from N.L. is derived from NL is derived from Newfoundland speed bump is derived from Newfoundlander is derived from Newfoundlands is derived from Nfld is derived from Nfld.