This is the 979th most frequent Chinese word.
博士
"博士" means "Doctor" or "PhD."
Here, '博士' refers to a person who has achieved a doctoral degree in a specific field.
他是一位化学博士。
He is a chemistry Ph.D.
Here, '博士' refers to an individual specializing in linguistics who has achieved the highest academic degree.
我听说她是语言学博士,但她也对历史很有研究。
I heard she is a linguistics doctorate, but she also has deep knowledge in history.
In this sentence, '博士' is used to denote someone with a doctorate degree working in a research capacity.