acid test(n = noun.cognition) - a rigorous or crucial appraisal;
is a kind of appraisal, assessment

N  experiment, essay, analysis, screen, trial, tentative method, t=atonnement, verification, probation, experimentum crucis, proof, (demonstration), criterion, diagnostic, test, probe, crucial test, acid test, litmus test, crucible, reagent, check, touchstone, pix, assay, ordeal, ring, litmus paper, curcuma paper, turmeric paper, test tube, analytical instruments, empiricism, rule of thumb, feeler, trial balloon, pilot balloon, messenger balloon, pilot engine, scout, straw to show the wind, speculation, random shot, leap in the dark, analyzer, analyst, assayist, adventurer, experimenter, experimentist, experimentalist, scientist, engineer, technician, subject, experimentee, guinea pig, experimental animal, protocol, experimental method, blind experiment, double-blind experiment, controlled experiment, poll, survey, opinion poll, epidemiological survey, retrospective analysis, retrospective survey, prospective survey, prospective analysis, statistical analysis, literature search, library research, tryout, audition, discovery, measurement, evidence, deduction, induction, abduction, experimental, empirical, probative, probatory, probationary, provisional, analytic, docimastic, tentative, unverified, unproven, speculative, untested, on trial, under examination, on probation, under probation, on one's trial, on approval, check it out, give it a try, see how it goes, Run it up the flagpole and see who salutes.

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 value, acrylic acid, adenylic acid, adipic acid, agglutination test, alginic acid, alpha test, alpha-linolenic acid, alpha-naphthol test, amino acid, aminoalkanoic acid, aminobenzoic acid, aptitude test, arsenic acid, ascorbic acid, aspartic acid, barbituric acid, battery acid, becchi's test, benzoic acid, beta test, beta-hydroxybutyric acid, bile acid, blood test, 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, clinical test, cloze test, complement fixation test, creatine phosphoric acid, cyanic acid, cyanuric acid, decanedioic acid, decanoic acid, deoxyribonucleic acid, desoxyribonucleic acid, diagnostic test, dibasic acid, dichromic acid, dick test, diethylbarbituric acid, docosahexaenoic acid, dodecanoic acid, domoic acid, eicosapentaenoic acid, elaeostearic acid, elaidic acid, electrolyte acid, eleostearic acid, essential amino acid, ethacrynic acid, ethanedioic acid, ethanoic acid, faecal occult test, fatty acid, fecal occult test, ferricyanic acid, ferrocyanic acid, field test, fluoroboric acid, fluosilicic acid, folic acid, formic acid, friedman test, fulminic acid, fulvic acid, fumaric acid, gallic acid, gamma acid, gamma aminobutyric acid, gibberellic acid, glucose tolerance test, glutamic acid, glutaminic acid, glyceric acid, glycolic acid, glycollic acid, heptadecanoic acid, heterophil test, hexacosanoic acid, hexadecanoic acid, hexanedioic acid, hexanoic acid, high test, 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, inkblot test, intelligence test, intradermal test, iodic acid, iodoamino acid, iq test, isobutylphenyl propionic acid, isocyanic acid, itaconic acid, juniperic acid, kendall test, krebs citric acid cycle, lactic acid, lauric acid, linoleic acid, linolenic acid, linolic acid, litmus test, low test, lysergic acid, lysergic acid diethylamide, maleic acid, manganic acid, mantoux test, margaric acid, means test, mefenamic acid, mental test, metaphosphoric acid, methacrylic acid, ministry of transportation test, molisch test, molisch's test, monobasic acid, monounsaturated fatty acid, mot test, 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, pap test, papanicolaou test, para aminobenzoic acid, patch test, paternity test, pectic acid, pentanoic acid, perboric acid, perchloric acid, periodic acid, permanganic acid, personality test, phenylic acid, phosphoric acid, phosphorous acid, phthalic acid, picric acid, pku test, polyphosphoric acid, polyunsaturated fatty acid, potassium acid carbonate, preclinical test, pregnancy test, projective test, propanoic acid, propenoic acid, propionic acid, prussic acid, psa blood test, psychological test, psychometric test, pteroylglutamic acid, pteroylmonoglutamic acid, pyrogallic acid, pyroligneous acid, pyrophosphoric acid, pyruvic acid, queckenstedt's test, rabbit test, racemic acid, radioactive iodine excretion test, radioactive iodine test, radioactive iodine uptake test, recombinant deoxyribonucleic acid, retinoic acid, ribonucleic acid, ricinoleic acid, road test, rorschach test, rubin test, saccharic acid, salicylic acid, saturated fatty acid, schick test, scratch test, screen test, sebacic acid, selenic acid, silicic acid, skin test, sludge acid, smear test, snellen test, sorbic acid, stanford binet test, stanford-binet test, stearic acid, stool test, stress test, subcutaneous test, suberic acid, succinic acid, sulfanilic acid, sulfonic acid, sulfuric acid, sulphanilic acid, sulphonic acid, sulphuric acid, super acid, tannic acid, tartaric acid, test, test ban, test bed, test case, test copy, test drive, test driver, test equipment, test flight, test fly, test instrument vehicle, test match, test paper, test period, test pilot, test range, test rocket, test room, test suit, test tube, tetrabasic acid, tetradecanoic acid, thematic apperception test, thiocyanic acid, thymic acid, tine test, titanic acid, toluic acid, trans fatty acid, treadmill test, tribasic acid, tricarboxylic acid cycle, trichloracetic acid, trichloroacetic acid, triphosphoric acid, tuberculin skin test, tuberculin test, tungstic acid, undecylenic acid, unsaturated fatty acid, uric acid, valeric acid, valproic acid, vanadic acid, wassermann test, widal test, widal's test, xanthic acid