The Collaborative International Dictionary of English v.0.48:
Soi-disant \Soi`-di*sant"\ (sw[aum]"d[-e]`z[aum]N"), a. [F.; soi one's self + disant, p. pr. of dire to say.] Self-named; self-styled; pretended; would-be. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
soi-disant adj 1: as claimed by and for yourself often without justification; "the self-styled `doctor' has no degree of any kind" [syn: self-styled, soi-disant]