Serf

n. indentured servant, vassal, servant who is bound to a feudal lord and can be transferred with the estate; slave, person held in bondage

SERF (spin exchange relaxation-free) is a magnetometer.Photographs of a serf magnetometer [1] have been published by the Romalis Group at Princeton.
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Serfdom is the socio-economic status of peasants under feudalism, and specifically relates to Manorialism. It was a condition of bondage or modified slavery seen primarily during the Middle Ages in Europe. Serfdom was the enforced labour of serfs on the fields of landowners, in return for protection and the right to work on their leased fields.
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Noun
1. (Middle Ages) a person who is bound to the land and owned by the feudal lord
(synonym) helot, villein
(hypernym) thrall
(hyponym) cotter, cottier
(classification) Middle Ages, Dark Ages
(classification) Europe

n. serf, villein, feudatory

n. serf