In dictionaries:
BL Lac object
Active galaxy with variable emissions.
bl lac objects
bl lacertae object
A BL Lacertae object or BL Lac object is a type of active galactic nucleus or a galaxy with such an AGN, named after its prototype, BL Lacertae.
dns bl
BL 18-inch Mk I naval gun
a breech-loading naval rifle used by the Royal Navy during World War I.
BL 15-inch Mk I naval gun
The BL 15-inch Mark I succeeded the BL 13.5-inch Mk V naval gun.
BL postcode area
The BL postcode area, also known as the Bolton postcode area,Royal Mail, Address Management Guide, is a group of ten postcode districts in North West England.
BL 7.2-inch howitzer
a heavy artillery piece used by the British Army throughout the Second World War.
BL 60-pounder gun
The Ordnance BL 60-pounder was a British 5-inch (127 mm) heavy field gun designed in 1903–05 to provide a new capability that had been partially met by the interim QF 4.7 inch gun.
BL 9.2-inch howitzer
The Ordnance BL 9.2-inch howitzer was a heavy siege howitzer that formed the principal counter-battery equipment of British forces in France in World War I. It equipped a substantial number of siege batteries of the Royal Garrison Artillery.
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