Black's Law Dictionary (2nd edition)dictionaries

De Medio

A writ in the nature of a writ of right, which lay where upon a subin-feudation the mesne (or middle) lord suffered hls under-tenant or tenant paraveil to be distrained upon by the lord paramount for the rent due him from the mesne lord. Booth, Real Act. 136

Source: Black’s Law Dictionary 2nd Ed (1910)