GNU Collaborative International Dictionary of English

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1.       
   Deafen , v. t. [imp. & p. p. Deafened ; p. pr. & vb. n. Deafening.] [From Deaf.]
   To make deaf; to deprive of the power of hearing; to render incapable of perceiving sounds distinctly.
   1913 Webster
   Deafened and stunned with their promiscuous cries.
   Addison.
   
   1913 Webster
   (Arch.) To render impervious to sound, as a partition or floor, by filling the space within with mortar, by lining with paper, etc.
   1913 Webster