• (n.) The clay of which such pots or cases are made. • (n.) A pot or case of fire clay, in which fine stoneware is inclosed while baking in the kiln; a seggar. Found on http://thinkexist.com/dictionary/meaning/sagger/
Sag'ger noun [ See Seggar .] 1. A pot or case of fire clay, in which fine stoneware is inclosed while baking in the kiln; a seggar. 2. The clay of which such pots or cases are made. Found on http://www.encyclo.co.uk/webster/S/5