I know that nowdays 先生 is used as the honorific for medical doctors (among
others), but I'm curious what honorific was used in older periods, Edo and
Sengoku specifically.

Also if this usage of 先生 is entirely modern, when and why did it become such?
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2020-08-03T22:44:39.590
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2020-08-03T22:44:39.590
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question
history honorifics
Form of address for a medical doctor in Edo and Sengoku eras