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facula

Flag: gbEnglishOxford Dictionary of English
facula /ˈfakjʊlə /
▸ noun
(plural faculae /ˈfakjʊliː/)
a bright region on the surface of the sun, linked to the subsequent appearance of sunspots in the same area.
▪ a bright spot on the surface of a planet.
– DERIVATIVES
facular adjective
– ORIGIN early 18th century: from Latin, diminutive of fax, fac- ‘torch’.