What is ESSENTIAL?

Pertaining to the essence of a substance. Pertaining to the peculiar and distinctive characteristic of a disease. E. Oils; the essential or volatile oils They occur in almost all parts of the plants except the cotyledons of the seeds. They impart the peculiar and characteristic odors to the plants, furnish the perfumes, spices, and aromatics, and many of them possess valuable medicinal properties. Chemically, essential oils are often divided roughly into three clsses,

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Definition of  ESSENTIAL