UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌbɑːbəˈrɒsə/US:USA pronunciation: respellingUSA pronunciation: respelling(bär′bə rosə)

WordReference Random House Unabridged Dictionary of American English © 2020
Bar•ba•ros•sa  (bär′bə rosə),USA pronunciation n. 
  1. BiographicalFrederick. See  Frederick I (def. 1).
  2. Militarythe planning and operational code name the Germans gave to their invasion of the Soviet Union (June 22, 1941).

Collins Concise English Dictionary © HarperCollins Publishers::
Barbarossa /ˌbɑːbəˈrɒsə/ n
  1. the nickname of the Holy Roman Emperor Frederick I
    See Frederick Barbarossa
  2. real name Khair ed-Din. c. 1465–1546, Turkish pirate and admiral: conquered Tunis for the Ottomans (1534)
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