The Collaborative International Dictionary of English v.0.48:

Vermiculate \Ver*mic"u*late\, v. t. [imp. & p. p.
   Vermiculated; p. pr. & vb. n. Vermiculating.] [L.
   vermiculatus inlaid so as to resemble the tracks of worms, p.
   p. of vermiculari to be full of worms, vermiculus a little
   worm. See Vermicular.]
   To form or work, as by inlaying, with irregular lines or
   impressions resembling the tracks of worms, or appearing as
   if formed by the motion of worms.
   [1913 Webster]