Deraign
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
DEREYN, or DEREINE (Law Lat. dera Uonare, dirationare, or disrationare; Law Fr. dereiner, derener, disreigner, disrener, contra for deraisner or deraisoner).
In old English law
To prove; to "deraign the warranty paramount."
St. 31 Hen.