A large and ornamental tree, with large compound leaves, and bearing white flowers and a fruit or nut with a prickly shell. The nuts have a bitter taste, and are sometimes used as food for cattle. In some countries chestnuts are ground, and mixed with the food of horses; hence the name horse chestnut. They are also made into a strong paste for bookbinders and shoemakers, and in France and Switzerland they are used in cleaning woolens and in the washing and bleaching of linen. The bark of the tree is sometimes used in tanning leather.

Horse-power or H.P. The power of lifting 33,000 lbs. weight one foot high in a minute ; it is entitled indicated or nominal.