Of, relating to, or derived from living organisms: organic matter. Of, relating to, or affecting a bodily organ: an organic disease. Of, marked by, or involving the use of fertilizers or pesticides that are strictly of animal or vegetable origin: organic vegetables; an organic farm. Raised or conducted without the use of drugs, hormones, or synthetic chemicals: organic chicken; organic cattle farming. Serving organic food: an organic restaurant. Simple, healthful, and close to nature: an organic lifestyle. Having properties associated with living organisms. Resembling a living organism in organization or development; interconnected: society as an organic whole. Constituting an integral part of a whole; fundamental. Law Denoting or relating to the fundamental or constitutional laws and precepts of a government or an organization. Chemistry Of or designating carbon compounds. A substance, especially a fertilizer or pesticide, of animal or vegetable origin. Chemistry An organic compound.