Now Rare a quack; charlatan
Origin of quacksalverMiddle Dutch (from source Dutch kwaksalver) from quacken, to quack, brag, boast + zalf, salve, akin to German salbe, salve
A quack or charlatan.
Origin of quacksalverObsolete DutchMiddle Dutch quac- unguent or quacken to quack, boast Middle Dutch salven to salve
c 1570, from Dutch kwakzalver (“hawker of salve"), from Middle Dutch quacken (“to brag, boast; to croak")