oak

noun

1. the hard durable wood of any oak; used especially for furniture and flooring

   noun.plant

   Source: WordNet 3.0

2. a deciduous tree of the genus Quercus; has acorns and lobed leaves

   noun.plant

   Examples

   Great oaks grow from little acorns.

   Synonyms oak tree

   Source: WordNet 3.0

3. Any tree or shrub of the genus <i>Quercus</i>. The oaks have alternate leaves, often variously lobed, and staminate flowers in catkins. The fruit is a smooth nut, called an <i>acorn</i>, which is more or less inclosed in a scaly involucre called the <i>cup</i> or <i>cupule</i>. There are now recognized about three hundred species, of which nearly fifty occur in the United States, the rest in Europe, Asia, and the other parts of North America, a very few barely reaching the northern parts of South America and Africa. Many of the oaks form forest trees of grand proportions and live many centuries. The wood is usually hard and tough, and provided with conspicuous medullary rays, forming the silver grain.

   noun

   Source: webster1913