retinic

Adjective

resinous (comparative more resinous, superlative most resinous)

1. Of or relating to resin.
   • Resin, pitch, sealing-wax, caoutchouc, sulphur, gutta-percha, and generally all bodies commonly termed resinous, besides a great variety of others, will be found to acquire, after friction, the power of attracting light bodies, and hence will be said, according to a limitation of terms already...1855, William Somerville Orr, Orr's Circle of the Sciences, page 205

   Synonyms:

   resinaceous

2. (dated) Negative (of electric charge).

   Antonyms:

   vitreous