The Collaborative International Dictionary of English v.0.48:

Lentiginous \Len*tig"i*nous\ (-n[u^]s), a. [L. lentiginosus. See
   Lentigo.]
   Of or pertaining to lentigo; freckly; scurfy; furfuraceous.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lentiginous
    adj 1: relating to or covered with or resembling freckles [syn:
           freckled, lentiginous, lentiginose]