woolsack noun. ['wʊlsak] In sense 2 now Woolsack. ME.
[from WOOL noun + SACK noun¹.]
1. A large package or bale of wool. ME.
b. A fat person. rare (Shakes.). Only in L16.

2. Orig., a seat made of a bag of wool for the use of judges attending the House of Lords (now only at the opening of Parliament). Later, the wool-stuffed seat of the Lord Chancellor in the House of Lords; the position of Lord Chancellor. L16.

[TahlilGaran] English Dictionary ▲