essential

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essential

1. Biochem (of an amino acid or a fatty acid) necessary for the normal growth of an organism but not synthesized by the organism and therefore required in the diet
2. derived from or relating to an extract of a plant, drug, etc.
3. Logic (of a property) guaranteed by the identity of the subject; necessary. Thus, if having the atomic number 79 is an essential property of gold, nothing can be gold unless it has that atomic number
4. Music denoting or relating to a note that belongs to the fundamental harmony of a chord or piece
5. Pathol (of a disease) having no obvious external cause
6. Geology (of a mineral constituent of a rock) necessary for defining the classification of a rock. Its absence alters the rock's name and classification
7. Music an essential note
References in periodicals archive ?
Direct transesterification of plasma fatty acids for the diagnosis of essential fatty acid deficiency in cystic fibrosis.
n DRY HAIR: It may be linked with inadequate protein intake, essential fatty acid deficiency, thyroid disease and menopause or chemicals used on hair.
The authors assumed that the lack of a growth response to the different lipid sources and different levels of HUFA may be due to insufficient duration (75 days) of the experiment to achieve an essential fatty acid deficiency.

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