from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Decomposition or transformation of a compound caused by heat.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The decomposition of a material or compound due to heat in the absence of oxygen or any other reagents
from The Century Dictionary and Cyclopedia
- n. Chemical decomposition produced by exposure to a high temperature.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. transformation of a substance produced by the action of heat
From the Ancient Greek terms πῦρ (pyr, "fire") and λύσις (lysis, "loosing"). (Wiktionary)