Thrithing
Defined in 4 dictionaries — Cyclopedic (1922), Ballentine's (1916), Black's (1910), Stimson (1881)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
A division consisting of three or four hundreds.
Ballentine's Law Dictionary
James A. Ballentine · 1916
A riding. See Riding.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In Saxon and old English law. The third part of a county; a division of a county consisting of three or more hundreds. Cowell. Corrupted to the modern "riding," which is still used in Yorkshire. 1 Bl. Comm. 116.
Glossary of Technical Terms, Phrases, and Maxims of the Common Law
Frederic Jesup Stimson · 1881
sax. A riding; a third part