essential amino acid(n = noun.substance) - an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet;
is a kind of amino acid, aminoalkanoic acid
has particulars: arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, tryptophane, valine

2-hydroxybenzoic acid, 2-methylpropenoic acid, acetic acid, acetoacetic acid, acetylsalicylic acid, acid, acid anhydrides, acid dye, acid halide, acid head, acid hydrogen, acid precipitation, acid process, acid rain, acid rock, acid test, acid value, acrylic acid, adenylic acid, adipic acid, alginic acid, alpha-linolenic acid, amino, amino acid, amino group, amino plastic, amino resin, aminoalkanoic acid, aminobenzoic acid, arsenic acid, ascorbic acid, aspartic acid, barbituric acid, battery acid, benzoic acid, beta-hydroxybutyric acid, bile acid, boracic acid, boric acid, bromic acid, butanoic acid, butyric acid, capric acid, caproic acid, caprylic acid, carbamic acid, carbolic acid, carbonic acid, carbonic acid gas, carboxylic acid, cerotic acid, chloric acid, chlorohydric acid, chlorous acid, cholic acid, chromic acid, citric acid, citric acid cycle, creatine phosphoric acid, cyanic acid, cyanuric acid, decanedioic acid, decanoic acid, deoxyribonucleic acid, desoxyribonucleic acid, dibasic acid, dichromic acid, diethylbarbituric acid, docosahexaenoic acid, dodecanoic acid, domoic acid, eicosapentaenoic acid, elaeostearic acid, elaidic acid, electrolyte acid, eleostearic acid, essential, essential condition, essential hypertension, essential oil, essential thrombocytopenia, essential tremor, ethacrynic acid, ethanedioic acid, ethanoic acid, fatty acid, ferricyanic acid, ferrocyanic acid, fluoroboric acid, fluosilicic acid, folic acid, formic acid, fulminic acid, fulvic acid, fumaric acid, gallic acid, gamma acid, gamma aminobutyric acid, gibberellic acid, glutamic acid, glutaminic acid, glyceric acid, glycolic acid, glycollic acid, heptadecanoic acid, hexacosanoic acid, hexadecanoic acid, hexanedioic acid, hexanoic acid, homogentisic acid, humic acid, hyaluronic acid, hydrazoic acid, hydriodic acid, hydrobromic acid, hydrochloric acid, hydrocyanic acid, hydrofluoric acid, hydrofluosilicic acid, hydroiodic acid, hydroxy acid, hydroxyacetic acid, hydroxybenzoic acid, hydroxybutyric acid, hypochlorous acid, hyponitrous acid, hypophosphoric acid, hypophosphorous acid, indoleacetic acid, indolebutyric acid, iodic acid, iodoamino acid, isobutylphenyl propionic acid, isocyanic acid, itaconic acid, juniperic acid, krebs citric acid cycle, lactic acid, lauric acid, linoleic acid, linolenic acid, linolic acid, lysergic acid, lysergic acid diethylamide, maleic acid, manganic acid, margaric acid, mefenamic acid, metaphosphoric acid, methacrylic acid, monobasic acid, monounsaturated fatty acid, mucic acid, muriatic acid, myristic acid, nalidixic acid, nicotinic acid, nitric acid, nitrohydrochloric acid, nitrous acid, nucleic acid, octadecanoic acid, octanedioic acid, oleic acid, omega-3 fatty acid, omega-6 fatty acid, orthoboric acid, orthophosphoric acid, orthophosphorous acid, oxalacetic acid, oxalic acid, oxaloacetic acid, oxybutyric acid, oxygen acid, palmitic acid, pantothenic acid, para aminobenzoic acid, pectic acid, pentanoic acid, perboric acid, perchloric acid, periodic acid, permanganic acid, phenylic acid, phosphoric acid, phosphorous acid, phthalic acid, picric acid, polyphosphoric acid, polyunsaturated fatty acid, potassium acid carbonate, propanoic acid, propenoic acid, propionic acid, prussic acid, pteroylglutamic acid, pteroylmonoglutamic acid, pyrogallic acid, pyroligneous acid, pyrophosphoric acid, pyruvic acid, racemic acid, recombinant deoxyribonucleic acid, retinoic acid, ribonucleic acid, ricinoleic acid, saccharic acid, salicylic acid, saturated fatty acid, sebacic acid, selenic acid, silicic acid, sludge acid, sorbic acid, stearic acid, suberic acid, succinic acid, sulfanilic acid, sulfonic acid, sulfuric acid, sulphanilic acid, sulphonic acid, sulphuric acid, super acid, tannic acid, tartaric acid, tetrabasic acid, tetradecanoic acid, thiocyanic acid, thymic acid, titanic acid, toluic acid, trans fatty acid, tribasic acid, tricarboxylic acid cycle, trichloracetic acid, trichloroacetic acid, triphosphoric acid, tungstic acid, undecylenic acid, unsaturated fatty acid, uric acid, valeric acid, valproic acid, vanadic acid, xanthic acid