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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
[4] Nonstandard abbreviations: CF, cystic fibrosis; CFTR, cystic fibrosis transmembrane conductance regulator; PUFA, polyunsaturated fatty acid; EFAD, essential fatty acid deficiency; AA, arachidonic acid; DHA, docosahexaenoic acid; [FEV.sub.1], forced expiratory volume in 1 s; BMI, body mass index; SFA, saturated fatty acid; MUFA, monounsaturated fatty acid; LA, linoleic acid; GLA, [gamma]-linolenic acid; DGLA, dihomo-[gamma]-linolenic acid; DTA, docosatetraenoic acid; DPA, docosapentaenoic acid; EPA, eicosapentaenoic acid; ETA, eicosatrienoic acid (mead acid); ALA, [alpha]-linolenic acid.
These are 1) casein and wheat (gluten) allergy (more correctly termed hypersensitivity); 2) essential fatty acid deficiency; 3) niacin deficiency; and 4) glutamic acid and glycine supplementation.
Essential fatty acid requirements of cats: Pathology of essential fatty acid deficiency. American Journal of Veterinary Research 45, 1310-1317.

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