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raie ultime. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Etymology
First attested in the plural in February 1910 and in the singular in 1920; French: raie (“line”) + ultime (“final”).
Pronunciation
Noun
raie ultime (plural raies ultimes)
- (spectroscopy) The line in an atomic spectrum that results from a transition to the lowest level of excitation from the first higher non-metastable level.
1910 February 10, Nature, LXXXII, page 440:In the second paper M. de Gramont considers the distribution of raies ultimes in different stellar types, having studied for this purpose the Harvard classifications, the numerous publications of Sir Norman Lockyer, and the works of Sir William Huggins.
1920, Optical Methods in Control and Research Laboratories, page 4:De Gramont distinguished by the name of Raie Ultime that line in the spectrum of an element which is the last to disappear.