advocatus diaboli

Unus latro ingratus cum esset typus Diaboli, et Serpentis, et Jud, qui se in ligno suffocavit.
The Works of Sir Thomas Browne (Volume 1 of 3)|Thomas Browne
Still, I must confess that, in advancing these arguments, I feel somewhat like an advocatus diaboli.
A Librarian's Open Shelf|Arthur E. Bostwick
Discussion of the eternal servant problem is apt to be one-sided; it was quite time that we heard from the advocatus diaboli.
Punch, or the London Charivari, Vol. 152, February 14, 1917|Various
The vox populi is often little more than the vox diaboli; but the voice of ages is the voice of God.
Blackwood's Edinburgh Magazine -- Volume 57, No. 351, January 1845|Various

Then Arnold, or Arnold's secret advocatus diaboli, began upon another and quite different line.
In Luck at Last|Walter Besant

British Dictionary definitions for advocatus diaboli

advocatus diaboli

/ Latin (ˌædvəˈkɑːtəs daɪˈæbəˌlaɪ) /

noun

another name for the devil's advocate

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