The Collaborative International Dictionary of English v.0.48:

Encase \En*case"\, v. t. [Cf. Enchase.]
   To inclose in or as if in a case. See Incase. --Beau. & Fl.
   [1913 Webster]

WordNet (r) 3.0 (2006):

encase
    v 1: enclose in, or as if in, a case; "my feet were encased in
         mud" [syn: encase, incase, case]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "encase":
   bag, barrel, basket, bottle, bottle up, box, box in, box up, cabin,
   can, capsule, carton, case, cask, casket, cloister, closet, coffin,
   confine, cramp, crate, crib, embox, embrace, encapsulate, encyst,
   enfold, enshroud, entomb, envelop, enwrap, hamper, immure, invest,
   jar, lap, pack, package, parcel, pot, sack, sheathe, shroud,
   smother, straiten, surround, swaddle, swathe, tank, tin, wrap,
   wrap about, wrap up