| a North American tree, Betula lenta, having smooth, blackish bark and twigs that are a source of methyl salicylate. |
| sweet birch n.
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sweet birch
North American ornamental and timber tree in the family Betulaceae. Usually about 18 m (60 feet) tall, the tree may reach 24 m or more in the southern Appalachians; on poor soil it may be stunted and shrublike.
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