ganister

[gan-uh-ster]
noun
1.
a highly refractory, siliceous rock used to line furnaces.
2.
a synthetic product similar to this rock, made by mixing ground quartz with a bonding material.

Origin:
1805–15; origin uncertain

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World English Dictionary
ganister or gannister (ˈɡænɪstə)
 
n
1.  a highly refractory siliceous sedimentary rock occurring beneath coal seams: used for lining furnaces
2.  a similar material synthesized from ground quartz and fireclay
 
[C19: of unknown origin]
 
gannister or gannister
 
n
 
[C19: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Silicate mortar is similar to silicate grout but also contains fillers such as silica, quartz, or ganister.
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