- A Eurasian alder tree (Alnus glutinosa) that grows in wet soil and is naturalized in parts of North America.
- See winterberry.
(countable and uncountable, plural black alders)
- (countable, uncountable) A tree, Alnus glutinosa, of many practical uses, growing in moist circumstances in Europe.
- (uncountable) Wood or other product of the tree.
- American winterberry, Ilex verticillata.