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The Collaborative International Dictionary
segger

Seggar \Seg"gar\, n. [Prov. E. saggard a seggar, seggard a sort of riding surtout, contr. fr. safeguard.] A case or holder made of fire clay, in which fine pottery is inclosed while baking in the kin. [Written also saggar, sagger, and segger.]
--Ure.

Wiktionary
segger

n. (alternative form of saggar English)