/ · 1894 Brewer’s · S · S.T.P
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stands for Sanctæ Theologiæ Professor. Professor is the Latin for Doctor. D.D.—i.e. Divinity Doctor or Doctor of Divinity—is the English equivalent of the Latin S.T.P.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.