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| oak Any tree of the genus Quercus in the order Fagales, characterized by simple, usually lobed leaves, scaly winter buds, a star-shaped pith, and its fruit, the acorn, which is a nut; the wood is tough, hard, and durable, generally having a distinct pattern | |||
| German oak (Quercus ilex); holly oak (Quercus ilex); holm oak (Quercus ilex) | |||