Usually means: Active galaxy with variable emissions.
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We found 9 dictionaries that define the word BL Lac object:

General (7 matching dictionaries)
  1. BL Lac object: Merriam-Webster
  2. BL Lac object: Oxford Learner's Dictionaries
  3. BL Lac object: Collins English Dictionary
  4. BL Lac object: Wiktionary
  5. BL Lac object: Dictionary.com
  6. BL Lac object: Wikipedia, the Free Encyclopedia
  7. BL Lac object: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. BL Lac object: Encyclopedia

Science (1 matching dictionary)
  1. BL Lac Object: Extragalactic Astronomy

Definitions from Wiktionary (BL Lac object)

noun:  (astronomy) a type of active galaxy with an active galactic nucleus (AGN), named after its prototype, BL Lacertae

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