Definition of BL Lac object in English:

BL Lac object

Line breaks: BL Lac ob¦ject

Entry from British & World English dictionary


A type of remote elliptical galaxy with a very compact starlike nucleus, remarkable for its considerable short-term variations in brightness and radio emissions.


BL Lac, short for BL Lacertae, the designation of the first such object discovered (originally thought to be a variable star).

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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
turned backwards