H

H, h

[eych]
noun, plural H's or Hs, h's or hs.
1.
the eighth letter of the English alphabet, a consonant.
2.
any spoken sound represented by the letter H or h, as in hot or behave.
3.
something having the shape of an H .
4.
a written or printed representation of the letter H or h.
5.
a device, as a printer's type, for reproducing the letter H or h.
Dictionary.com Unabridged

H

1.
2.
Grammar, head.
3.
Electricity, henry.
4.
Slang. heroin.
5.

H

Symbol.
1.
the eighth in order or in a series.
2.
(sometimes lowercase) the medieval Roman numeral for 200. Compare Roman numerals.
3.
Chemistry, hydrogen.
4.
Biochemistry, histidine.
5.
Physics.
a.
enthalpy.
b.
horizontal component of the earth's magnetic field.
6.
Music. the letter used in German to indicate the tone B.

H

1
Symbol, Chemistry.
Also, 1H, Ha.

H

2
Symbol, Chemistry.
Also, 2H, Hb.

H

3
Symbol, Chemistry.
Also, 3H, Hc.

h

h

Symbol, Physics.

H.

(in prescriptions) an hour.

Origin:
< Latin hōra

h.

2.
4.
heavy sea.
7.
8.
Baseball. hit; hits.
9.
horns.
10.
Also, hr. hour; hours.
Also, H.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
h or H (eɪtʃ)
 
n , pl h's, H's, Hs
1.  the eighth letter and sixth consonant of the modern English alphabet
2.  a speech sound represented by this letter, in English usually a voiceless glottal fricative, as in hat
3.  a.  something shaped like an H
 b.  (in combination): an H-beam
 
H or H
 
n

h
 
symbol for
1.  physics Planck constant
2.  hecto-
3.  chess See algebraic notation

H
 
symbol for
1.  chem hydrogen
2.  physics
 a.  magnetic field strength
 b.  Hamiltonian
3.  electronics henry or henries
4.  thermodynamics enthalpy
5.  Compare B (on Brit pencils, signifying degree of hardness of lead) hard: H; 2H; 3H
6.  slang heroin
 
abbreviation for
7.  Hungary (international car registration)

h. or H.
 
abbreviation for
1.  harbour
2.  height
3.  hour
4.  husband
 
H. or H.
 
abbreviation for

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

H
the pronunciation "aitch" was in O.Fr. (ache), and is from a presumed L.L. *accha (cf. It. effe, elle, emme), with the central sound approximating the value of the letter when it passed from Roman to Germanic, where it at first represented a strong, distinctly aspirated -kh- sound close to that in Scottish
loch. In earlier L. the letter was called ha. In Romance languages, the sound became silent in L.L. and was omitted in O.Fr. and It., but it was restored in M.E. spelling in words borrowed from O.Fr., and often later in pronunciation, too. Thus Mod.Eng. has words ultimately from L. with missing -h- (e.g. able, from L. habile); with a silent -h- (e.g. heir, hour); with a formerly silent -h- now vocalized (e.g. humble, honor); and even a few with an excrescent -h- fitted in confusion to words that never had one (e.g. hostage, hermit). Relics of the formerly unvoiced -h- persist in pedantic insistence on an historical (object) and in obs. mine host. The use in digraphs (e.g. -sh-, -th-) goes back to the ancient Gk. alphabet, which used it in -ph-, -th-, -kh- until -H- took on the value of a long "e" and the digraphs acquired their own characters. The letter passed into Roman use before this evolution, and thus retained there more of its original Sem. value.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

h abbr.
The symbol for Planck's constant..

H
The symbol for the element hydrogen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
h  
  1. Abbreviation of height

  2. The symbol for Planck's constant.


H  
  1. The symbol for henry.

  2. The symbol for hydrogen.


hydrogen   (hī'drə-jən)  Pronunciation Key 
Symbol H
The lightest and most abundant element in the universe, normally consisting of one proton and one electron. It occurs in water in combination with oxygen, in most organic compounds, and in small amounts in the atmosphere as a gaseous mixture of its three isotopes (protium, deuterium, and tritium) in the colorless, odorless compound H2. Hydrogen atoms are relatively electropositive and form hydrogen bonds with electronegative atoms. In the Sun and other stars, the conversion of hydrogen into helium by nuclear fusion produces heat and light. Hydrogen is used to make rocket fuel, synthetic ammonia, and methanol, to hydrogenate fats and oils, and to refine petroleum. The development of physical theories of electron orbitals in hydrogen was important in the development of quantum mechanics. Atomic number 1; atomic weight 1.00794; melting point -259.14°C; boiling point -252.8°C; density at 0°C 0.08987 gram per liter; valence 1. See Periodic Table. See Note at oxygen.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang Dictionary

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 benchmark names (Dhrystone, Rhealstone, etc.); this is probably patterning on the original Whetstone (the name of a laboratory) but influenced by the fannish/counterculture h infix.
FOLDOC
Computing Dictionary

h definition


1. A simple markup language intended for quick conversion of existing text to hypertext.
2. A method of marking common words to call 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 benchmark names (Dhrystone, Rhealstone, etc.); this follows on from the original Whetstone (the name of a laboratory) but may have been influenced by the fannish/counterculture h infix.
[Jargon File]
(1994-11-04)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
h
  1. height

  2. hour

  3. Planck's constant

H
  1. enthalpy

  2. Hamiltonian

  3. handicapped accessible

  4. haze

  5. henry

  6. heroin

  7. Hispanic

  8. hit

  9. humidity

  10. Hungary (international vehicle ID)

  11. hydrogen

h.
  1. harbor

  2. hard

  3. hardness

  4. high

  5. horn

  6. hundred

  7. husband

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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