Definition of facula in English:



  • 1A bright region on the surface of the sun, linked to the subsequent appearance of sunspots in the same area.

    • ‘Associated with sunspots are brighter areas called faculae.’
    • ‘Although not easily discerned in telescopic views of the Sun, these features are brilliant enough that the overall effect of the combined spots and faculae is to boost irradiance levels.’
    • ‘If the faculae loom above the surface, they could radiate light efficiently, thereby boosting the sun's overall brightness, especially during the solar maximum.’
    1. 1.1 A bright spot on the surface of a planet.


Early 18th century: from Latin, diminutive of fax, fac- ‘torch’.