Just to try and clear up your confusion:
On the "Magic" cards of the "Imperial Hellkite" and the "Crimson Hellkite" etc. you will find printed "Creature - Dragon".
Someone has used their fertile imagination to give names to these fantasy creatures, but they are definitely dragons.
The word does not appear in any of my regular dictionaries, although I found
Source: Random House Unabridged Dictionary, Copyright (c)1997, by Random
Pronunciation: (hel'k?t"), [key]
a fiendishly cruel and wicked person."http://www.infoplease.com/ipd/A0473412.html
Source: Webster's Revised Unabridged Dictionary (1913)
Hellkite Hell"kite', n.
A kite of infernal breed. --Shak.http://dict.die.net/hellkite/
A "kite" here refers to a bird of prey, not a dragon.
From the Scottish play (Act IV, Scene iii)
"He has no children. All my pretty ones?
Did you say all? O hell-kite! All?
What, all my pretty chickens and their dam
At one fell swoop?"