BL Lacertae object
noun
BL La·cer·tae object
-ləˈsərtē-,
-tē-
variants or less commonly BL Lac object
-ˈlak-
: a celestial object that is similar to a quasar in the intensity of its radiation and is recognizable by its radio emissions
Word History
Etymology
BL Lacertae, original designation for the first such object to be discovered, from BL, designation for the 89th variable star in a constellation + New Latin Lacertae, genitive of Lacerta, a constellation
First Known Use
1975, in the meaning defined above