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.

Source: Webster's Revised Unabridged Dictionary (1913)