1. natural resin a plant exudate
  2. natural gas a fossil fuel in the gaseous state
  3. naturalness the quality of being natural or based on natural principles
  4. naturalise make into a citizen
  5. naturalize make into a citizen
  6. natural process a process existing in or produced by nature
  7. natural virtue one of the four virtues derived from nature
  8. naturally in a natural or normal manner
  9. natural resource material in the environment that can be used by people
  10. natural order the physical universe considered as an orderly system subject to natural (not human or supernatural) laws
  11. natural glass magma of any composition that cooled very rapidly
  12. naturalism an artistic movement emphasizing realistic description
  13. natural law a body of inherent rules governing human conduct in society
  14. naturalist a biologist knowledgeable about botany and zoology
  15. natural relating to or concerning the physical world
  16. natural rubber an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products
  17. natural science the sciences involved in the study of the physical world and its phenomena
  18. natural resources resources (actual and potential) supplied by nature
  19. naturalized introduced from another region and persisting without cultivation
  20. naturally occurring existing by nature and without artificial aid