Writ of right, of reasonable part A writ which lay between privies in blood, as between brothers in gavelkind, or between sisters or other coparceners for lands in fee simple, where one was deprived of his or her share by another. Reg. Orig. 3b; Fitzh. Nat Brev. 9, B. Abolished by St 3 A 4 Wm. IV. c 27.