Source : Webster's Revised Unabridged Dictionary (1913)

Proboscidian \Pro`bos*cid"i*an\, a. (Zo["o]l.)
   Pertaining to the Proboscidea. -- n. One of the Proboscidea.

Source : WordNet®

proboscidian
     n : massive herbivorous mammals having tusks and a long trunk
         [syn: {proboscidean}]