Subject: Why is Antarctica not considered the largest desert in the world?

We are studying about biomes in science.  By definition Antarctica is 
classsified a desert because of its low percipation. It is much larger than the 
Sahare Desert.  I asked my science teacher this question and he did not know 
the answer.  I have been trying to find out why also, but no where have Ihave 
been unalbe to find where it explains the the Sahara desert being the 
largest "hot desert" and Antarctica being really the largest desert.  Can you 
explain this to me?  

Re: Why is Antarctica not considered the largest desert in the world?