natural dye n.
A dye obtained from animals or plants.
- Natural english
Programming in normal, spoken English. [Sammet 1969, p.768].
- Natural family planning
noun a method for preventing pregnancy with drugs or devices but rather based on the rhythm method, basal body temperature, or the cervical mucus method
- Natural flavor
noun a flavor-enhancing substance made from the chemical extracts of natural sources (animals, plants, etc.) Examples artificial flavors are considered somewhat safer to consume than natural flavors due to the standards of purity and mixture consistency that are enforced either by the company or by law.
- Natural frequency
noun 1. (physics) the frequency at which a system vibrates when set in free vibration Compare forcing frequency