A fee limited to a particular line of heirs; they are not free to sell it or give it away WordNet 3.0 & Open English WordNet

In English common law, fee tail or entail, or tailzie in Scots law, is a form of trust, established by deed or settlement, that restricts the sale or inheritance of an estate in real property and prevents that property from being sold, devised by will, or otherwise alienated by the tenant-in-possession, and instead causes it to pass automatically, by operation of law, to an heir determined by the settlement deed. Wikipedia

A fideicommissum is a type of bequest in which the beneficiary is encumbered to convey parts of the decedent's estate to someone else. Wikipedia

A term of art in common law describing a limited form of succession Wikipedia Disambiguation

legal institution of ancient Rome Wikidata

Form of trust in English common law Wikidata

An estate in land in common law wherein the land is inherited, but cannot be sold, devised by will, or otherwise alienated by the owner, but which passes by operation of law to the owner's heirs upon his death. Wiktionary

Estate in land in common law wherein the land is inherited. Wiktionary (translation)