Definition of "BL"

BL¹

proper noun
1. Initialism of British Leyland.
noun
plural BLs
1. (UK military) Initialism of breechloader.
  Quotations
  B.L. cartridges have lubricators choked inside the cartridges of 40-pr. and lower natures.
  1879, War Office, Manual of Siege and Garrison Artillery Exercises, page 37
adjective
not comparable
1. (UK military) Initialism of breechloading.

BL²

noun
uncountable
1. Initialism of boys' love (“yaoi media”).