hairy vetch
- n European vetch much cultivated as forage and cover crops
haematite
- n the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form
gyroplane
- n an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller
gyroscope
- n rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction
gyrostabiliser
- n a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane
gyrostabilizer
- n a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane
gyrus cinguli
- n a long curved structure on the medial surface of the cerebral hemispheres; the cortical part of the limbic system
h
- 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
- n a unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second
- n the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
- n the 8th letter of the Roman alphabet
- n (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure
enthalpy is the amount of energy in a system capable of doing mechanical work
h-bomb
- n a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium
h. g. wells
- n prolific English writer best known for his science-fiction novels; he also wrote on contemporary social problems and wrote popular accounts of history and science (1866-1946)