immured

Short definition from Wiktionary

Verb

1. 1
   simple past and past participle of immure

Adjective

1. 1
   imprisoned or confined.
2. 2
   buried within or built into a wall, whether respectfully (as with shrines, monuments, or tombs) or as torture (if buried alive).
3. 3
   walled in.
4. 4
   trapped or captured (within the surrounding matrix).