lucules

It was shewn also, that a gaseous substance in flame appears more luminous when seen obliquely than perpendicular, which explains what are known as _faculæ_ and _lucules_, being those parts of the solar disk that shew themselves brighter than other portions of the surface.

Chambers's Edinburgh Journal, No. 441 Volume 17, New Series, June 12, 1852 Various 1836