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H1

Symbol, Chemistry
1.
Also, 1H, Ha.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for 1h

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)
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 1h

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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1h in Medicine

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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1h 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.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang definitions & phrases for 1h

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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Related Abbreviations for 1h

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
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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