oak (EN)
noun, adjective

noun “oak”

sg. oak, pl. oaks or uncountable
  1. a type of tree that loses its leaves every year, has leaves with deep curves on the edges, grows acorns, and has very strong wood
    The children played under the shade of the old oak in the park.
  2. the strong wood that comes from oak
    The dining table is crafted from solid oak.
  3. a deep, rich brown color similar to the color of oak
    She chose a dress in a deep oak to match the autumn leaves.
  4. the main door of a set of rooms in a college or similar place, which can be locked; often used in the phrase "sport one's oak"
    When the professor needed some quiet time, he would sport his oak to avoid interruptions.

adjective “oak”

oak, non-gradable
  1. made from the wood of the oak tree
    The large dining table in the kitchen is oak and very sturdy.
  2. deep, rich brown color, similar to the color of oak wood
    She wore a beautiful dress in a deep oak shade that matched the autumn leaves.