from Wiktionary, Creative Commons Attribution/Share-Alike License.
- proper noun astronomy The brightest star in the southern constellation of
Centaurus. Alpha Centauri is actually a binarystar with Alpha Centauri Cor Proxima Centaurias a third component. Alpha Centauri A is the brightest star of the system and is somewhat brighter than our sun. Alpha Centauri Bis somewhat fainter than Alpha Centauri A but much brighter than Proxima Centauri.
from Wiktionary, Creative Commons Attribution/Share-Alike License
From α (brightest) + Centauri ("of the constellation Centaurus")
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