Definition of Frank ferm
In English law, a species of estate held in socage, said by Britton to be "lands and tenements whereof the nature of the fee is changed by feoffment out of chivalry for certain yearly services, and in respect whereof neither homage, ward, marriage, nor relief can be demanded.” 2 Bl.Comm. 80.
That's the definition of Frank ferm in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.