The Collaborative International Dictionary of English v.0.48:

Varan \Va"ran\, n. [F.] (Zool.)
   The monitor. See Monitor, 3.
   [1913 Webster]

WordNet (r) 3.0 (2006):

varan
    n 1: any of various large tropical carnivorous lizards of Africa
         and Asia and Australia; fabled to warn of crocodiles [syn:
         monitor, monitor lizard, varan]