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1. colorless odorless gas (lightest of the known elements). eighth letter of the English alphabet. h\h\ (āch), the eighth letter 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, &thlig;, as in shall, thing, &thlig;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.note: the name (aitch) is from the french ache; its form is from the latin, and this from the greek h, which was used as the sign of the spiritus asper (rough breathing) before it came to represent the long vowel, gr. ?. the greek h is from phÂœnician, the ultimate origin probably being egyptian. etymologically h is most closely related to c; as in e. horn, l. cornu, gr. ke`ras; e. hele, v. t., conceal; e. hide, l. cutis, gr. ky`tos; e. hundred, l. centum, gr. 'e-kat-on, skr. &csdot;ata.h piece (mining), the part of a plunger pump which contains the valve.h \h\ (h&add;). (mus.) the seventh degree in the diatonic scale, being used by the germans for b natural. see: b.h n.
2. 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 [syn: hydrogen, h, atomic number 1].
3. 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 [syn: henry, h].
4. the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10\-34 joule-second [syn: planck's constant ].
5. the 8th letter of the roman alphabet [syn: h].
6. a narcotic that is considered a hard drug; a highly addictive morphine derivative [syn: heroin, diacetylmorphine, h, horse, junk, scag, shit, smack].
7. the eighth letter 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.
8. It is used with certain consonants to form digraphs representing sounds which are not found in the alphabet, as sh, th, &thlig;, as in shall, thing, &thlig;ine ; 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 , with the latter, the sound of f, as in phase, phantom.
9. 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.10. See Guide to Pronunciation, §§ 153, 179, 181-3, 237-8.11. The seventh degree in the diatonic scale, being used by the Germans for B natural.12. See B. the 8th letter of the Roman alphabet.13. ascender.14. The symbol for Planck's constant. the eighth letter of the English alphabet aitch H-bomb.
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