H definition

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6 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  H \H\ ([=a]ch),
     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, [th], as in


     shall, thing, [th]ine (for zh see [sect]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, [sect][sect] 153, 179, 181-3, 237-8.
     [1913 Webster]
  
     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. [eta]. The Greek H is from Ph[oe]nician, 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. [.c]ata.
           [1913 Webster]
  
     {H piece} (Mining), the part of a plunger pump which contains
        the valve.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  H \H\ (h[aum]). (Mus.)
     The seventh degree in the diatonic scale, being used by the
     Germans for B natural. See {B}.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Ion \I"on\ ([imac]"[o^]n), n. [Gr. 'io`n, neut, of 'iw`n, p. pr.
     of 'ie`nai to go.]
     1. (Elec. Chem.) an atom or goup of atoms (radical) carrying
        an electrical charge. It is contrasted with neutral atoms
        or molecules, and free radicals. Certain compounds, such
        as sodium chloride, are composed of complementary ions in
        the solid (crystalline) as well as in solution. Others,
        notably acids such as hydrogen chloride, may occur as
        neutral molecules in the pure liquid or gas forms, and
        ionize almost completely in dilute aqueous solutions. In
        solutions (as in water) ions are frequently bound
        non-covalently with the molecules of solvent, and in that
        case are said to be solvated. According to the
        electrolytic dissociation theory, the molecules of
        electrolytes are divided into ions by water and other
        solvents. An ion consists of one or more atoms and carries
        one unit charges of electricity, 3.4 x 10^{-10}
        electrostatic units, or a multiple of this. Those which
        are positively electrified (hydrogen and the metals) are
        called {cations}; negative ions (hydroxyl and acidic atoms
        or groups) are called {anions}.
  
     Note: Thus, hydrochloric acid ({HCl}) dissociates, in aqueous
           solution, into the hydrogen ion, {H+}, and the chlorine
           ion, {Cl-}; ferric nitrate, {Fe(NO3)3}, yields the
           ferric ion, {Fe+++}, and nitrate ions, {NO3-}, {NO3-},
           {NO3-}. When a solution containing ions is made part of
           an electric circuit, the cations move toward the
           cathode, the anions toward the anode. This movement is
           called migration, and the velocity of it differs for
           different kinds of ions. If the electromotive force is
           sufficient, electrolysis ensues: cations give up their
           charge at the cathode and separate in metallic form or
           decompose water, forming hydrogen and alkali;
           similarly, at the anode the element of the anion
           separates, or the metal of the anode is dissolved, or
           decomposition occurs. Aluminum and chlorine are
           elements prepared predominantly by such electrolysis,
           and depends on dissolving compounds in a solvent where
           the element forms ions. Electrolysis is also used in
           refining other metals, such as copper and silver. Cf.
           {Anion}, {Cation}.
           [Webster 1913 Suppl.]
  
     2. One of the small electrified particles into which the
        molecules of a gas are broken up under the action of the
        electric current, of ultraviolet and certain other rays,
        and of high temperatures. To the properties and behavior
        of ions the phenomena of the electric discharge through
        rarefied gases and many other important effects are
        ascribed. At low pressures the negative ions appear to be
        electrons; the positive ions, atoms minus an electron. At
        ordinary pressures each ion seems to include also a number
        of attached molecules. Ions may be formed in a gas in
        various ways.
        [Webster 1913 Suppl.]

From WordNet (r) 2.0 [wn]:

  H
       n 1: 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}, {atomic number 1}]
       2: 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}]
       3: 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}]
       4: the 8th letter of the Roman alphabet
       5: (thermodynamics) a thermodynamic quantity equal to the
          internal energy of a system plus the product of its volume
          and pressure; "enthalpy is the amount of energy in a
          system capable of doing mechanical work" [syn: {heat
          content}, {total heat}, {enthalpy}]

From Jargon File (4.3.1, 29 Jun 2001) [jargon]:

  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.
  
  

From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:

  h
       
          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)
       
       

















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