The Collaborative International Dictionary of English v.0.48:

Immure \Im*mure"\, v. t. [imp. & p. p. Immured; p. pr. & vb.
   n. Immuring.] [Pref. im- in + mure: cf. F. emmurer.]
   1. To wall around; to surround with walls. [Obs.] --Sandys.
      [1913 Webster]

   2. To inclose whithin walls, or as within walls; hence, to
      shut up; to imprison; to incarcerate.
      [1913 Webster]

            Those tender babes
            Whom envy hath immured within your walls. --Shak.
      [1913 Webster]

            This huge convex of fire,
            Outrageous to devour, immures us round. --Milton.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "immured":
   barred, behind bars, beleaguered, beset, besieged, blockaded,
   bound, cabined, caged, cloistered, closed-in, confined, cooped,
   cordoned, cordoned off, corralled, cramped, cribbed, enclosed,
   fenced, hedged, hemmed, imprisoned, in captivity, in durance vile,
   in prison, in stir, incarcerated, jailed, leaguered, locked up,
   mewed, paled, penned, pent-up, quarantined, railed, restrained,
   shut-in, walled, walled-in