Plural of demesgne; multiple estates or lands held in direct control, especially referring to a lord's personal agricultural holdings.
The plural form of the variant spelling demesgne, following Middle English conventions where -s was added for plural forms, preserving the older spelling throughout.
This word exists in a twilight zone of English history—it's the plural of an already archaic variant, meaning it appears mostly in medieval manuscripts where you can watch spelling conventions still being negotiated.
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