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 Dutch : Middle 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")