Writ of privilege
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
A writ for the release of a member of parliament arrested on civil process. Writ of proclamation. A writ commanding the sheriff to post notices of intention to adjudge one an outlaw. See 3 Bl. Comm. 284. Writ of prohibition. See Prohibition.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A process to enforce or maintain a privilege; particniarly to secure the release of a person arrested in a civil suit contrary to his privilege.
Defined under Privilege in Black's Law Dictionary.