The Collaborative International Dictionary of English v.0.48:

Resinous \Res"in*ous\ (-?s), a. [L. resinous: cf. F.
   r['e]sineux. See Resin.]
   Of or pertaining to resin; of the nature of resin; resembling
   or obtained from resin.
   [1913 Webster]

   Resinous electricity (Elec.), electricity which is exited
      by rubbing bodies of the resinous kind. See Negative
      electricity, under Negative.
      [1913 Webster]

WordNet (r) 3.0 (2006):

resinous
    adj 1: having the characteristics of pitch or tar [syn:
           pitchy, resinous, resiny, tarry]