The Collaborative International Dictionary of English v.0.48:

Imbed \Im*bed"\, v. t. [imp. & p. p. Imbedded; p. pr. & vb. n.
   Imbedding.] [Pref. im- in + bed. Cf. Embed.]
   To sink or lay, as in a bed; to deposit in a partly inclosing
   mass, as of clay or mortar; to cover, as with earth, sand,
   etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

imbed
    v 1: fix or set securely or deeply; "He planted a knee in the
         back of his opponent"; "The dentist implanted a tooth in
         the gum" [syn: implant, engraft, embed, imbed,
         plant]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "imbed":
   bed, bed in, comprise, confirm, contain, deep-dye, define, embed,
   enclose, enfold, engraft, engrave, entrench, establish, etch, fix,
   found, ground, impact, implant, impress, imprint, include, infix,
   ingrain, inlay, inscribe, inset, internalize, jam, keep within,
   lodge, pack, plant, print, put in, root, seat, set, set in, settle,
   stamp, stereotype, surround, wedge