| H | a narcotic that is considered a hard drug |
|---|---|
| H | the 8th letter of the Roman alphabet |
| H | 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 |
| H | a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas |
| H | the constant of proportionality relating the energy of a photon to its frequency |
| H | a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium |
| H | prolific English writer best known for his science-fiction novels |
| H | British writer of short stories (1870-1916) |
| H | United States journalist and literary critic (1880-1956) |
| H | a unit of power equal to 746 watts |
| H | binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid |
| H | (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing |