- [countable, uncountable] (also oak tree [countable])
a large tree that produces small nuts called acorns. Oaks are common in northern countries and can live to be hundreds of years old. 栎树；橡树 
The forest is famous for its ancient oak trees. 这片森林以其古老的橡树而闻名。 a gnarled old oak tree 多节瘤的老栎树 forests of oak and pine 长有松树和栎树的森林 The oaks were planted in the 16th century. 橡树种植于16世纪。
- [uncountable]
the hard wood of the oak tree 栎木；橡木
Word OriginOld English āc, of Germanic origin; related to Dutch eik and German Eiche.
Idioms
great/tall oaks from little acorns grow
- (saying)
something large and successful often begins in a very small way 参天橡树长自小小橡实；合抱之树，生于毫末