reversing layer
Astronomy now chiefly historical
noun
The lower region of the solar chromosphere, formerly regarded as a distinct layer where the dark Fraunhofer lines of the solar spectrum are produced, superimposed on the continuous spectrum of the underlying photosphere.
Origin
Late 19th century; earliest use found in The Leeds Mercury.
- north by east (or west)
- North Canadian River
- north canoe
- North Cape
- North Carolina
- North Carolinian
- north-central
- North Channel
- North Charleston
- North Chicago
- North Circular
- Northcliffe, 1st Viscount
- North Country
- North Dakota
- North Dakotan
- Northdown
- north-east
- Northeast
- northeaster
- north-easterly
- north-eastern
- northeasterner
- north-easternmost
- Northeast Kingdom
- North-East Passage