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H, h

[eych] /eɪtʃ/
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.

H

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

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.
  1. enthalpy.
  2. horizontal component of the earth's magnetic field.
  3. magnetic intensity.
6.
Music. the letter used in German to indicate the tone B.

H1

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

H2

Symbol, Chemistry
1.
Also, 2H, Hb.

H3

Symbol, Chemistry
1.
Also, 3H, Hc.

h

1.
hard.

h

Symbol, Physics.

H.

1.
(in prescriptions) an hour.
Origin
< Latin hōra

h.

1.
2.
hard.
3.
4.
heavy sea.
5.
6.
7.
high.
8.
Baseball. hit; hits.
9.
horns.
10.
Also, hr. hour; hours.
11.
12.
Also, H.

eta

[ey-tuh, ee-tuh] /ˈeɪ tə, ˈi tə/
noun
1.
the seventh letter of the Greek alphabet (H, η).
2.
the vowel sound represented by this letter.
Origin
< Greek êta; compare Hebrew ḥeth heth
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for h

h

/eɪtʃ/
noun (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.
  1. something shaped like an H
  2. (in combination): an H-beam

h

symbol
1.
(physics) Planck constant
2.
hecto-
3.
(chess) See algebraic notation

H

symbol
1.
(chem) hydrogen
2.
(physics)
  1. magnetic field strength
  2. Hamiltonian
3.
(electronics) henry or henries
4.
(thermodynamics) enthalpy
5.
(on Brit pencils, signifying degree of hardness of lead) hard: H, 2H, 3H Compare B (sense 9)
6.
(slang) heroin
abbreviation
7.
Hungary (international car registration)

eta1

/ˈiːtə/
noun
1.
the seventh letter in the Greek alphabet (Η, η), a long vowel sound, transliterated as e or ē
Word Origin
Greek, of Phoenician origin; compare Hebrew heth

eta2

/ˈeɪtə/
noun (pl) eta, etas
1.
(in Japan, formerly) a member of a class of outcasts who did menial and dirty tasks
Word Origin
C19: Japanese

ETA1

abbreviation
1.
estimated time of arrival

ETA2

/ˈɛtə/
noun acronym
1.
Euzkadi ta Askatsuna: an organization of militant Basque nationalists attempting to gain independence for the Basques, esp those ruled by Spain, until a ceasefire in 1998, by means of guerrilla warfare
Word Origin
Basque, literally: Basque Nation and Liberty

h.

abbreviation
1.
harbour
2.
height
3.
hour
4.
husband
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for h

H

the pronunciation "aitch" was in Old French (ache "name of the letter H"), and is from a presumed Late Latin *accha (cf. Italian 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 Latin the letter was called ha.

In Romanic languages, the sound became silent in Late Latin and was omitted in Old French and Italian, but it was restored in Middle English spelling in words borrowed from French, and often later in pronunciation, too. Thus Modern English has words ultimately from Latin with missing -h- (e.g. able, from Latin habile); with a silent -h- (e.g. heir, hour); with a formerly silent -h- now often vocalized (e.g. humble, humor, herb); 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 obsolete mine host. The use in digraphs (e.g. -sh-, -th-) goes back to the ancient Greek 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 Semitic value.

Online Etymology Dictionary, © 2010 Douglas Harper
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h in Medicine

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

H
The symbol for the element hydrogen.

eta e·ta (ā'tə, ē'tə)
n.

Symbol η The seventh letter of the Greek alphabet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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h in Science
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)   
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 definitions & phrases for h

H

noun

Heroin (Narcotics)

Related Terms

big h


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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h in Technology


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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Related Abbreviations for h

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

ETA

  1. embryo toxicity assay
  2. Employment and Training Administration
  3. estimated time of arrival

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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