Agister
Agister ({not transcribed}) , noun
[Anglo-Norman agistour.]
(a)
(Law) Formerly, an officer of the king's forest, who had the care of cattle agisted, and collected the money for the same; -- hence called gisttaker, which in England is corrupted into guest-taker.
(b)
(Law) Now, one who agists or takes in cattle to pasture at a certain rate; a pasturer. — Mozley & W
Also: Agistor