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1.
Zetsu means Venus Fly Trap in Japanese. Zetsu is a character on the rather popular anime/manga, Naruto. Zetsu is currently a member of the Akatsuki organization. Zetsu has the ability to grow, or sprout from multiple places at one time, although, like the Byakuugan, he only has a certain radius of vision. Akatsuki usually uses him for spy, and assassination missions. Not too much has been revealed as per his techniques.
Zetsu: "More enemies are closing in on the base. One of their names are.. 'Maito Gai'."
by Wesley Fisher June 14, 2007
 
2.
Zetsu, meaning "reed flute" in Japanese. He is a ninja, a member of the Akatsuki, most often used as a spy. He has a split personality, one black and one white. He also has a Venus Fly Trap growing on his shoulders, which wrap around his head. His home village is unknown.
Pein, Konan, Zetsu, Hidan, Kakuzu, Kisame, Itachi, Deidara, Sasori, and Tobi are Akatsuki members.
by Brittyn March 18, 2009
 
3.
Unlike what the others have said, zetsu has nothing to do with Naruto, other than the fact that there's a character with that name.
Zetsu is japanese for FEVER
zetsu ga aru - to have a fever
by notanarutard January 24, 2011