soi-disant

tekaistu self-styled Self-styled; self-proclaimed.
1860, w:John Ruskin|John Ruskin, s:Unto This Last (Ruskin)|Unto This Last, Cornhill Magazine

Among the delusions which at different periods have possessed themselves of the minds of large masses of the human race, perhaps the most curious -- certainly the least creditable -- is the modern soi-disant science of political economy, based on the idea that an advantageous code of social action may be determined irrespectively of the influence of social affection.