Holy Communion.
House of Commons.
Dictionary.com Unabridged


for the sake of honor.

< Latin honōris causā


Symbol, Chemistry.
Also, 3H, Hc.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

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

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)

abbreviation for
1.  Holy Communion
2.  (in Britain) House of Commons

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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Word Origin & History

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..

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
  1. Abbreviation of height

  2. The symbol for Planck's constant.

  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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Computing Dictionary

hc definition

The compiler for the h hyperbook language.

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

  2. hour

  3. Planck's constant

  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

  1. hard cover [book]

  2. hazardous constituents

Latin honoris causa (for the sake of honor)
  1. Holy Communion

  2. House of Commons

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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