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The Collaborative International Dictionary
dizard

Dizzard \Diz"zard\ (d[i^]z"z[~e]rd), n. [See Dizzy, and cf. Disard.] A blockhead. [Obs.] [Written also dizard, and disard.] -- Diz"zard*ly, adv. [Obs.]

Wiktionary
dizard

n. A talkative fool (context obsolete English)