The Collaborative International Dictionary of English v.0.48:

Plexiform \Plex"i*form\, a. [Plexus + -form: cf. F. Plexiforme.]
   Like network; complicated. --Quincy.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "plexiform":
   barred, cancellated, crossbarred, filigreed, grated, gridded,
   laced, lacelike, lacy, latticelike, meshed, meshy, mullioned,
   netlike, netted, netty, reticular, reticulate, reticulated,
   retiform, streaked, striped