The Collaborative International Dictionary of English v.0.48:

Interlard \In`ter*lard"\, v. t. [imp. & p. p. Interlarded; p.
   pr. & vb. n. Interlarding.] [F. entrelarder. See Inter-,
   and Lard.]
   [1913 Webster]
   1. To place lard or bacon amongst; to mix, as fat meat with
      lean. [Obs.]
      [1913 Webster]

            Whose grain doth rise in flakes, with fatness
            interlarded.                          --Drayton.
      [1913 Webster]

   2. Hence: To insert between; to mix or mingle; especially, to
      introduce that which is foreign or irrelevant; as, to
      interlard a conversation with oaths or allusions.
      [1913 Webster]

            The English laws . . . [were] mingled and
            interlarded with many particular laws of their own.
                                                  --Sir M. Hale.
      [1913 Webster]

            They interlard their native drinks with choice
            Of strongest brandy.                  --J. Philips.
      [1913 Webster]

WordNet (r) 3.0 (2006):

interlard
    v 1: introduce one's writing or speech with certain expressions
         [syn: intersperse, interlard]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "interlard":
   admix, alloy, amalgamate, bemingle, blend, coalesce, combine,
   commingle, commix, compose, compound, concoct, conglomerate,
   diffuse, emulsify, fuse, hash, homogenize, immingle, immix, infuse,
   integrate, interblend, interfuse, interlace, intermingle, intermix,
   interpenetrate, intersow, intersperse, intersprinkle, intertwine,
   interweave, jumble, knead, merge, mingle, mingle-mangle, mix,
   mix up, scramble, shuffle, stir up, syncretize, throw together,
   toss together, work