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5 definitions found
 for black hole
From The Collaborative International Dictionary of English v.0.48 :

  black hole \black" hole`\
     A dungeon or dark cell in a prison; a military lock-up or
     guardroom; -- now commonly with allusion to the cell (the
     Black Hole) in a fort at Calcutta (called the Black Hole of
     Calcutta), into which 146 English prisoners were thrust by
     the nabob Suraja Dowla on the night of June 20, 1765, and in
     which 123 of the prisoners died before morning from lack of
     [1913 Webster]
           A discipline of unlimited autocracy, upheld by rods,
           and ferules, and the black hole.         --H. Spencer.
     [1913 Webster]
     2. (Physics, Astron.) An astronomical object whose mass is so
        condensed that the gravitational force does not allow
        anything, even light, to escape from its outer limit (the
        event horizon). The existence of such objects was first
        proposed from theoretical considerations. Because light
        cannot escape from such objects, they have not yet been
        detected with certainty (1998), but several "candidates"
        have been observed whose properties strongly suggest that
        they are black holes. Some theorists suggest that the
        centers of many galaxies may have large black holes at
        their cores. See also escape velocity.
     3. [from the astronomical black hole.] a place into which
        things may enter, but can never emerge. [Fig., Jocose] "He
        was so disorganized his office was a black hole."

From WordNet (r) 3.0 (2006) :

  black hole
      n 1: a region of space resulting from the collapse of a star;
           extremely high gravitational field

From Moby Thesaurus II by Grady Ward, 1.0 :

  85 Moby Thesaurus words for "black hole":
     Beehive, Cepheid variable, Hertzsprung-Russell diagram, Hyades,
     Messier catalog, NGC, POW camp, Pleiades, Seven Sisters,
     absolute magnitude, bastille, binary star, borstal,
     borstal institution, bridewell, brig, cell, concentration camp,
     condemned cell, death cell, death house, death row, detention camp,
     double star, dwarf star, federal prison, fixed star,
     forced-labor camp, gaol, giant star, globular cluster,
     gravity star, guardhouse, house of correction, house of detention,
     industrial school, internment camp, jail, jailhouse, keep,
     labor camp, lockup, magnitude, main sequence star,
     mass-luminosity law, maximum-security prison,
     minimum-security prison, neutron star, nova, open cluster,
     oubliette, pen, penal colony, penal institution, penal settlement,
     penitentiary, populations, prison, prison camp, prisonhouse,
     pulsar, quasar, quasi-stellar radio source, radio star,
     red giant star, reform school, reformatory, relative magnitude,
     sky atlas, spectrum-luminosity diagram, sponging house, star,
     star catalog, star chart, star cloud, star cluster, state prison,
     stellar magnitude, stockade, supernova, the hole, tollbooth,
     training school, variable star, white dwarf star

From The Jargon File (version 4.4.7, 29 Dec 2003) :

  black hole
      [common] What data (a piece of email or netnews, or a stream of TCP/IP
      packets) has fallen into if it disappears mysteriously between its origin
      and destination sites (that is, without returning a bounce message). ?I
      think there's a black hole at foovax!? conveys suspicion that site foovax
      has been dropping a lot of stuff on the floor lately (see drop on the
      floor). The implied metaphor of email as interstellar travel is
      interesting in itself. Readily verbed as blackhole: ?That router is
      blackholing IDP packets.? Compare bit bucket and see RBL.

From The Free On-line Dictionary of Computing (30 December 2018) :

  black hole
     1. An expression which depends on its own value or a technique
     to detect such expressions.  In graph reduction, when the
     reduction of an expression is begun, the root of the
     expression can be overwritten with a black hole.  If the
     expression depends on its own value, e.g.
     	x = x + 1
     then it will try to evaluate the black hole which will usually
     print an error message and abort the program.  A secondary
     effect is that, once the root of the expression has been
     black-holed, parts of the expression which are no longer
     required may be freed for garbage collection.
     Without black holes the usual result of attempting to evaluate
     an expression which depends on itself would be a stack
     overflow.  If the expression is evaluated successfully then
     the black hole will be updated with the value.
     Expressions such as
     	ones = 1 : ones
     are not black holes because the list constructor, : is lazy so
     the reference to ones is not evaluated when evaluating ones to
     2. Where an electronic mail message or news aritcle has
     gone if it disappears mysteriously between its origin and
     destination sites without returning a bounce message.
     Compare bit bucket.
     [{Jargon File]

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