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From The Collaborative International Dictionary of English v.0.48:
Whatso \What"so\, indef. pron. Whatsoever; whosoever; whatever; anything that. [Obs.] [1913 Webster] Whatso he were, of high or low estate. --Chaucer. [1913 Webster] Whatso the heaven in his wide vault contains. --Spenser. [1913 Webster]