The Collaborative International Dictionary of English v.0.48:

Intwine \In*twine"\, v. t. [Cf. Entwine.]
   To twine or twist into, or together; to wreathe; as, a wreath
   of flowers intwined. [Written also entwine.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Entwine \En*twine"\, v. t. [Pref. en- + twine. Cf. Intwine.]
   To twine, twist, or wreathe together or round. [Written also
   intwine.]
   [1913 Webster]

         Entwined in duskier wreaths her braided locks.
                                                  --Shelley.
   [1913 Webster]

         Thy glorious household stuff did me entwine. --Herbert.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Entwine \En*twine"\, v. i.
   To be twisted or twined.
   [1913 Webster]

         With whose imperial laurels might entwine no cypress.
                                                  --De Quincey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

entwine
    v 1: tie or link together [syn: knit, entwine]
    2: spin,wind, or twist together; "intertwine the ribbons";
       "Twine the threads into a rope"; "intertwined hearts" [syn:
       intertwine, twine, entwine, enlace, interlace,
       lace] [ant: untwine]

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "entwine":
   braid, burden, coil, corkscrew, cramp, cripple, cumber, curl,
   embarrass, encumber, enlace, enmesh, ensnarl, entangle, entoil,
   entrammel, entrap, fetter, hamper, hamstring, handicap, hobble,
   impede, interknit, interlace, intertie, intertissue, intertwine,
   intertwist, interweave, intort, intwine, involve, knit, lace, lame,
   lime, loom, loop, lumber, mat, net, noose, plait, pleach,
   press down, raddle, saddle with, shackle, snarl, spiral, splice,
   tangle, tissue, toil, trammel, twill, twine, twist, wattle, weave,
   web, weigh down, wreathe