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4 definitions found
 for BLT
From WordNet (r) 3.0 (2006) :

  BLT
      n 1: sandwich filled with slices of bacon and tomato with
           lettuce [syn: bacon-lettuce-tomato sandwich, BLT]

From V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014) :

  BLT
         BLock Transfer
         

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

  BLT
   /B?L?T/, /bl@t/, /belt/, n.,vt.
  
      Synonym for blit. This is the original form of blit and the ancestor of
      bitblt. It referred to any large bit-field copy or move operation (one
      resource-intensive memory-shuffling operation done on pre-paged versions of
      ITS, WAITS, and TOPS-10 was sardonically referred to as ?The Big BLT?). The
      jargon usage has outlasted the PDP-10 BLock Transfer instruction from
      which BLT derives; nowadays, the assembler mnemonic BLT almost always
      means ?Branch if Less Than zero?.
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  BLT
  
     1. /B-L-T/, /bl*t/ or (rarely) /belt/ Synonym for blit.
     This is the original form of blit and the ancestor of
     bitblt.  It refers to any large bit-field copy or move
     operation (one resource-intensive memory-shuffling operation
     done on pre-paged versions of ITS, WAITS and TOPS-10 was
     sardonically referred to as "The Big BLT").  The jargon usage
     has outlasted the PDP-10 BLock Transfer instruction from
     which BLT derives; nowadays, the assembly language
     mnemonic BLT almost always means "Branch if Less Than
     zero".
  
     2. bacon, lettuce and tomato (sandwich).
  
     [{Jargon File]
  

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