hydrodamalis
- n a genus of the family Dugongidae comprising only Steller's sea cow
hydrodamalis gigas
- n extinct large sirenian mammal formerly found near the Asiatic coast of the Bering Sea
hydrodiuril
- n a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension
hydroelectric turbine
- n turbine consisting of a large and efficient version of a water wheel used to drive an electric generator
hydrofluoric acid
- n a weak poisonous liquid acid; formed by solution of hydrogen fluoride in water
hydrofluorocarbon
- n a fluorocarbon emitted as a by-product of industrial manufacturing
hydrofluosilicic acid
- n an unstable poisonous corrosive acid known primarily in the form of its salts
hydrofoil
- n a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through
the fins of a fish act as hydrofoils - n a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds
hydrogen
- n a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
hydrogen azide
- n a colorless explosive liquid that is volatile and poisonous and foul-smelling
hydrogen bomb
- n a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium