essential oils

Plant-origin volatile organic compounds, more or less strongly smelling and imparting the ‘essence’ of the kind of plant from which they were extracted. Eucalyptus oil, citrus oil and the more volatile fraction of conifer resin are essential oils.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
Read the preface. Order the book.

Previous term | Next term