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From The Collaborative International Dictionary of English v.0.48:
Obtund \Ob*tund"\, v. t. [imp. & p. p. Obtunded; p. pr. & vb. n. Obtunding.] [L. obtundere, obtusum; ob (see Ob-) + tundere to strike or beat. See Stutter.] To reduce the edge, pungency, or violent action of; to dull; to blunt; to deaden; to quell; as, to obtund the acrimony of the gall. [Archaic] --Harvey. [1913 Webster] They . . . have filled all our law books with the obtunding story of their suits and trials. --Milton. [1913 Webster]