Meaning of ganister

gan•is•ter

Pronunciation: (gan'u-stur), [key]
— n.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.