windshaft means the part of a windmill that carries the sails and brake wheel (in smock and tower mills, and some post mills) or the head wheel and tail wheel in a post mill. Lexicurio rates it Sui generis — a strength score of 90 out of 100.
Etymology
From wind + shaft.
noun
- The part of a windmill that carries the sails and brake wheel (in smock and tower mills, and some post mills) or the head wheel and tail wheel in a post mill.