fnord /fnɔːrd/exclamation 2noun 1forms 1 exclamation2 •A word (which may or may not be "fnord" itself) commonly held to be invisible to the conscious mind, but subliminally causing a sense of unease or sudden anger when encountered. So used in the Illuminatus! trilogy. •A word defined as having no definition. noun1 •A metasyntactic variable, similar to foo and bar. formsfnords