De‐ba″cle (?), n. [F. débâcle, fr. débâcler to unbar, break loose; pref. dé- (prob. = L. dis) + bâcler to bolt, fr. L. baculum a stick.] (Geol.) A breaking or bursting forth; a violent rush or flood of waters which breaks down opposing barriers, and hurls forward and disperses blocks of stone and other débris.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.