What is Excommunicato Capiendo?

Legal Definition
In ecclesiastical law. A writ issuing out of chancery, founded on a bishop's cortificate that the defendant had been excommunicated, and requiring the sheriff to arrest and Imprison him, returnable to the king's bench. 4 Bl. Comm. 415; Bac. Abr. "Excommunication," E.
-- Black's Law Dictionary
Legal Definition
-- Ballentine's Law Dictionary