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German word Baum comes from Proto-Indo-European *bū-, Proto-Indo-European *bhū, and later Proto-Germanic *baumaz (Beam, balk. Tree.)
*bū- (Proto-Indo-European)
*bhū (Proto-Indo-European)
*baumaz (Proto-Germanic)
Beam, balk. Tree.
boum (Old High German)
Tree, beam.
Baum (German)
(nautical) boom. Tree.