Term used for the service one owed to the lord from whom one's own immediate lord held his land, thus 'outside' the local *manor. This use survived in the Dorset placename Ryme Forinseca. However, it can still be found in the anglicised Rye Foreign. [< Lat. forinsecus = on the outside] -
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.