Source : Webster's Revised Unabridged Dictionary (1913)

Geusdism \Geusd"ism\ (g[e^]d"[i^]z'm), n.
   The Marxian socialism and programme of reform through
   revolution as advocated by the French political leader Jules
   Basile Guesde (pron. g[e^]d) (1845- ). -- {Guesd"ist}, n. &
   a.