Old Words and Names in the Shire was a short treatise written by Merry Brandybuck sometime after the War of the Ring. In this work Merry discussed the kinship with the language of the Rohirrim of such "shire-words" as mathom and old elements in place names.
This treatise was kept in the library of Bucklebury, perhaps one of those important works that weren't copied into the Red Book.[1]