What is De Excommunicato Capiendo?

Legal Definition
A writ commanding the sheriff to arrest one who was excommunicated, and imprison him (ill he should become reconciled to the church. 3 BL Comm. 102, Smith v. Nelson, 18 Vt. 511.
-- Black's Law Dictionary
Legal Definition
A writ to arrest an excommunicated person.
-- Ballentine's Law Dictionary