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1.
Amaterasu (literally "Shining Heaven"), is a technique used by Uchiha Itachi while enabling the Mangekyou Sharingan. It is named after the Shinto sun goddess, Amaterasu. This jutsu is fire-element ninjutsu of the highest order and creates unquenchable jet-black flames said to be as hot as the sun and capable of burning for seven days and seven nights, as well as through any material.
Jiraiya: There is no escape. They're trapped in the esophagus of a fire-breathing rock toad from Myouboku Mountain.

Itachi: Amaterasu.

Jiraiya: ...!
by Kazama Arashi July 10, 2008
 
2.
The main goddess of the Shinto religion. Sun goddess.
Legend says that Amaterasu blessed the first emperor of Japan with a ruby (I think o.O I'm a bad Shinto *sighs*)
by Urban Dictionary July 26, 2004
 
3.
THE STUPIDEST FUCKING NICKNAME I'VE EVER HEARD IN MY LIFE!
Friend: Didn't that guy use to call you Amaterasu?
Me: Yeah but he's a dick so...On to the next one.
by ILIKEDANIDIOT July 31, 2013
 
4.
A move that Itachi uses that creates black fire that can burn through anything
Itachi uses amaterasu to burn through the frogs stomach that Jiraiya summoned around him
by jackthemexican May 31, 2007