n :  any of several colloidal light-sensitive preparations of silver and protein used in aqueous solution on mucous membranes as antiseptics and classified by their efficacy and irritant properties: as  a  :  a preparation containing 19 to 23 percent of silver and consisting of dark brown or almost black shining scales or granules - called also mild silver protein   b  :  a more irritant preparation containing 7.5 to 8.5 percent of silver and consisting of a pale yellowish orange to brownish black powder - called also strong silver protein  .
 
 
 
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