1. (noun) hydrogen, H, atomic number 1
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
Synonyms: enthalpy, henry, heat content, hydrogen, atomic number 1, total heat
2. (noun) henry, 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
Synonyms: enthalpy, henry, heat content, hydrogen, atomic number 1, total heat
3. (noun) Planck's constant, h
the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
Synonyms: enthalpy, atomic number 1, heat content, hydrogen, h, henry, total heat
4. (noun) H, h
the 8th letter of the Roman alphabet
Synonyms: enthalpy, henry, heat content, hydrogen, atomic number 1, total heat
5. (noun) heat content, total heat, enthalpy, H
(thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure
Synonyms: enthalpy, henry, heat content, hydrogen, atomic number 1, total heat
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Synonyms for H 
