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- 1 (also birch tree) a slender, fast-growing tree that has thin bark (often peeling) and bears catkins. Birch trees grow chiefly in north temperate regions, some reaching the northern limit of tree growth.
- Genus Betula, family Betulaceae: many species, including the yellow birch (B. alleghaniensis) of North America
verb[with object] chiefly historical
Old English bierce, birce, of Germanic origin; related to German Birke