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]