| a North American tree, Oxydendrum arboreum, of the heath family, having leaves with an acid flavor and drooping clusters of white flowers. |
| sorrel tree n. See sourwood. |
sour·wood  (sour'wŏŏd')  n. A deciduous tree (Oxydendrum arboreum) of the eastern United States, having drooping terminal panicles of small, white, urn-shaped flowers. Also called sorrel tree. [So called from its sour-tasting leaves.] |
