HOOP n.
A circle, or combination of circles, of thin whalebone, metal, or other elastic material, used for expanding the skirts of ladies' dresses; crinoline; -- used chiefly in the plural. Though stiff with hoops, and armed with ribs of whale. Pope.
HYDRIODIC a.
Pertaining to, or derived from, hydrogen and iodine; -- said of an acid produced by the combination of these elements. Hydriodic acid (Chem.), a pungent, colorless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Called also hydrogen iodine.
HYDROCYANIC a.
Pertaining to, or derived from the combination of, hydrogen and cyanogen. Hydrocyanic acid (Chem.), a colorless, mobile, volatile liquid, HCN, having a characteristic peach-blossom odor. It is one of the most deadly poisons. It is made by the action of sulphuric acid on yellow prussiate of potassium (potassium ferrocya…