Webster’s Revised Unabridged Dictionary · 1913
Bocardo
Bo·car′do (bō·kär′dō), n. [A mnemonic word.] 1. (Logic) A form of syllogism of which the first and third propositions are particular negatives, and the middle term a universal affirmative.
Baroko and Bocardo have been stumbling blocks to the logicians. Bowen.
2. A prison; — originally the name of the old north gate in Oxford, which was used as a prison. [Eng.] Latimer.