2 urgent; crucial
a burning problem
3 a form of heat treatment used to harden and finish ceramic materials or to prepare certain ores for further treatment by calcination
4 overheating of an alloy during heat treatment in which local fusion or excessive oxide formation and penetration occur, weakening the alloy
5 the heat treatment of particular kinds of gemstones to change their colour
1 any of several shrubs or trees, esp. the wahoo, that have bright red fruits or seeds
2 another name for →
3 any of several plants, esp. kochia, with a bright red autumn foliage
4 (Old Testament) the bush that burned without being consumed, from which God spoke to Moses (Exodus 3:2--4)
n a convex lens for concentrating the sun's rays into a small area to produce heat or fire
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"