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1 definition found From The Jargon File (version 4.4.7, 29 Dec 2003) [jargon]: 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?.