Re mountweazel. Is the copyright on the word or the definition? If I write a dictionary with a definition as copyright trap is that breach of copyright. if I

Re mountweazel. Is the copyright on the word or the definition? If I write a dictionary with a definition as copyright trap is that breach of copyright. if I use a word as defined in the dictionary, that is ficticious is that copyright infringement? What happens if that word enters usage? Are all other dictionaries required to be incomplete?