The Collaborative International Dictionary of English v.0.48:

Lentiscus \Len*tis"cus\ (l[e^]n*t[i^]s"k[u^]s), Lentisk
\Len"tisk\ (l[e^]n"t[i^]sk), n. [L. lentiscus, lentiscum: cf. F.
   lentisque.] (Bot.)
   A tree; the mastic. See Mastic.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lentisk
    n 1: an evergreen shrub of the Mediterranean region that is
         cultivated for its resin [syn: mastic, mastic tree,
         lentisk, Pistacia lentiscus]