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⇱ Wolf number - WordReference.com Dictionary of English

Wolf number

US:USA pronunciation: respellingUSA pronunciation: respelling(wŏŏlf; Fr. vôlf )


WordReference Random House Unabridged Dictionary of American English © 2026
Wolf′ num′ber  (wŏŏlf; Fr. vôlf ),USA pronunciation [Astron.]
  1. Astronomya number indicating the degree of sunspot activity on the sun as a factor of observer idiosyncrasies, the number of sunspot groups, and the number of individual sunspots. Also called relative sunspot number, sunspot number. 
  • after Rudolf Wolf (1816–93), Swiss astronomer 1975–80

'Wolf number' also found in these entries (note: many are not synonyms or translations):

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