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
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
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
4. (noun)H, h the 8th letter of the Roman alphabet
5. (noun)heat content, total heat, enthalpy, H (thermodynamics) a thermodynamic quantityequal 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"
Definition of 'h'
Webster Dictionary
1. h the eighthletter of the English alphabet, is classed among the consonants, and is formed with the mouth organs in the same position as that of the succeeding vowel. It is used with certain consonants to form digraphs representing sounds which are not found in the alphabet, as sh, th, /, as in shall, thing, /ine (for zh see /274); also, to modify the sounds of some other letters, as when placed after c and p, with the former of which it represents a compound sound like that of tsh, as in charm (written also tch as in catch), with the latter, the sound of f, as in phase, phantom. In some words, mostly derived or introduced from foreign languages, h following c and g indicates that those consonants have the hard sound before e, i, and y, as in chemistry, chiromancy, chyle, Ghent, Ghibelline, etc.; in some others, ch has the sound of sh, as in chicane. See Guide to Pronunciation, // 153, 179, 181-3, 237-8
2. h the seventh degree in the diatonic scale, being used by the Germans for B natural. See B
Definitions of 'h'
The New Hacker's Dictionary
1. h [from SF fandom] A method of ‘marking’ common words,
i.e., calling attention to the fact that they are being used in a
nonstandard, ironic, or humorous way. Originated in the fannish
catchphrase “Bheer is the One True Ghod!” from decades ago.
H-infix marking of ‘Ghod’ and other words spread into the 1960s
counterculture via underground comix, and into early hackerdom either from
the counterculture or from SF fandom (the three overlapped heavily at the
time). More recently, the h infix has become an expected feature of
benchmarknames (Dhrystone, Rhealstone, etc.); this is probably patterning
on the originalWhetstone (the name of a laboratory) but influenced by the
fannish/counterculture h infix.
Definitions of h 
