What is "hessian cloth"

Hessian \Hes"sian\, a. Of or relating to Hesse, in Germany, or to the Hessians.

Hessian boots, or Hessians, boot of a kind worn in England, in the early part of the nineteenth century, tasseled in front.
--Thackeray.

Hessian cloth, or Hessians, a coarse hempen cloth for sacking.

Hessian crucible. See under Crucible.

Hessian fly (Zo["o]l.), a small dipterous fly or midge ( Cecidomyia destructor). Its larv[ae] live between the base of the lower leaves and the stalk of wheat, and are very destructive to young wheat; -- so called from the erroneous idea that it was brought into America by the Hessian troops, during the Revolution.