oakmoss

/ˈoʊkˌmɔs/
noun
  1. A type of lichen that grows on oak trees, used in perfumes and as a fixative.
    • The perfumer added oakmoss to give the cologne a woody, earthy base note.
    • Oakmoss is a common ingredient in many classic men's fragrances.
    • Hikers often spot oakmoss clinging to the bark of old oak trees in the forest.