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Definition of oak
- 1 (also oak tree) a large tree which bears acorns and typically has lobed deciduous leaves. Oaks are dominant in many north temperate forests and are an important source of durable timber used in building, furniture, and (formerly) ships.
- Genus Quercus, family Fagaceae: many species, including the deciduous common (or English) oak (Q. robur), and the evergreen holm oak
Old English āc, of Germanic origin; related to Dutch eik and German Eiche