Note 169 — Chapter V · MANORS AND SERFDOM UNDER SAXON RULE.
Reading edition
This is a word often used in later documents, and seems to mean a certain amount of ploughing done as an equivalent for an allowance of grass. Grass-yrth may be the gafol for the share in the Lammas meadows, and the gafol-yrth for the arable in the yard-land.