Organic, Adj.

1. noting or pertaining to a class of chemical compounds that formerly comprised only those existing in or derived from plants or animals, but that now includes all other compounds of carbon.
2. characteristic of, pertaining to, or derived from living organisms: organic remains found in rocks.
3. of or pertaining to an organ or the organs of an animal, plant, or fungus.
4. of, pertaining to, or affecting living tissue: organic pathology.
9. developing in a manner analogous to the natural growth and evolution characteristic of living organisms; arising as a natural outgrowth.
11. pertaining to, involving, or grown with fertilizers or pesticides of animal or vegetable origin, as distinguished from manufactured chemicals: organic farming; organic fruits.
13. Archit. noting or pertaining to any work of architecture regarded as analogous to plant or animal forms in having a structure and a plan that fulfill perfectly the functional requirements for the building and that form in themselves an intellectually lucid, integrated whole.
14. Fine Arts. of or pertaining to the shapes or forms in a work of art that are of irregular contour and seem to resemble or suggest forms found in nature.
–noun.
15. a substance, as a fertilizer or pesticide, of animal or vegetable origin.

* Excerpted from the Random House Webster's Unabridged Dictionary 3.0.