facula
/ˈfækjʊlə/noun
(pl. faculae /-liː/)
1- Astronomy a bright region on the surface of the sun, linked to the subsequent appearance of sunspots in the same area【天文】（太阳表面的）光斑。
1.1
- a bright spot on the surface of a planet（行星表面的）光斑。
派生词
facular
adjective词源
early 18th cent.: from Latin, diminutive of fax, fac- 'torch'.