Estate tail, quasi

Definition of Estate tail, quasi

When a tenant for life grants his estate to a man and his heirs, as these words, though apt and proper to create an estate tail, cannot do so, because the grantor, being only tenant for life, cannot grant in perpetuum, therefore they are said to create an estate tail quasi, or improper.

That's the definition of Estate tail, quasi in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.