Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun   An 
aggregate ofsand ,bentonite clay ,pulverized coal , andwater , used in makingmoulds formetal casting . 
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
green in sense of being used in a wet state (akin to green wood).
			
		
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