OAK

[noun] - a large tree common esp. in northern countries, or the hard wood of this treea mighty oak [C]an oak table/cupboardoak panellingKing Charles II hid from his enemies in an oak (tree). [C]The timbers of those old sailing ships were mainly oak. [U]See picture: Trees(saying) 'Tall/Great oaks from little acorns grow' means that plans or organizations which start off very simple or small can sometimes develop into something which is extremely powerful and successful.