boiling point

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

• noun The temperature at which a liquid boils at a fixed pressure, especially under standard atmospheric conditions.
• noun The temperature at which the vapor pressure of a liquid is equal to the ambient atmospheric pressure.
• noun The point at which one loses one's temper.
• noun The point of crisis; the turning point.

from The Century Dictionary.

• noun The temperature at which a liquid is converted into vapor with ebullition; more strictly, the temperature at which the tension of the vapor is equal to the pressure of the atmosphere.

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

• noun physics The temperature at which a liquid boils, with the vapor pressure equal to the given external pressure.
• noun idiomatic The state of being heated, with high aggression.

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

• noun the temperature at which a liquid boils at sea level
• noun being highly angry or excited; ready to boil over