green tea

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Tea made from leaves that are not fermented before being dried.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Leaves of the tea plant which are treated with steam or roasted to denature the enzymes that cause the leaves to darken and change taste. (Without this step they would become oolong tea or black tea).
• noun A beverage brewed from green tea leaves.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun tea leaves that have been steamed and dried without fermenting