From Middle English ook, from Old English āc, from Proto-Germanic *aiks (compare Scots aik, West Frisian iik, Dutch eik, German Eiche, Danish eg), from Proto-Indo-European *eiḱ or *eiǵ- (compare Latin aesculus (“Durmast oak”), Lithuanian ąžuolas (“oak”), Albanian enjë (“juniper, yew”), Ancient Greek (aigilōps, “Turkey oak”))
- (countable) A tree of the genus Quercus.
- (uncountable) The wood of the oak.
- A rich brown colour, like that of oak wood.
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- (oak tree): tree
- (oak tree): acorn
oak (not comparable)
- (colour) of a rich brown colour, like that of oak wood.
- made of oak wood or timber
- an oak table, oak beam, etc
- consisting of oak trees
- an oak wood, oak forest, etc