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bour·tree | \ ˈbu̇(ə)r-(ˌ)trē 
, ˈbȯ(ə)r- \
, ˈbȯ(ə)r- \Medical Definition of bourtree
British
: a large Eurasian black-fruited elderberry (Sambucus nigra) formerly valued as a source of dyestuffs and of several folk remedies
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