widal test(n = noun.cognition) widal's test - a test for detecting typhoid fever and other salmonella infections;
is a kind of agglutination test

   A test for typhoid fever based on the fact that blood serum of one affected, in a bouillon culture of typhoid bacilli, causes the bacilli to agglutinate and lose their motility. [Webster 1913 Suppl.]

acid test, agglutination test, alpha test, alpha-naphthol test, aptitude test, becchi's test, beta test, blood test, clinical test, cloze test, complement fixation test, diagnostic test, dick test, faecal occult test, fecal occult test, field test, friedman test, glucose tolerance test, heterophil test, high test, inkblot test, intelligence test, intradermal test, iq test, kendall test, litmus test, low test, mantoux test, means test, mental test, ministry of transportation test, molisch test, molisch's test, mot test, pap test, papanicolaou test, patch test, paternity test, personality test, pku test, preclinical test, pregnancy test, projective test, psa blood test, psychological test, psychometric test, queckenstedt's test, rabbit test, radioactive iodine excretion test, radioactive iodine test, radioactive iodine uptake test, road test, rorschach test, rubin test, schick test, scratch test, screen test, skin test, smear test, snellen test, stanford binet test, stanford-binet test, stool test, stress test, subcutaneous test, 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, thematic apperception test, tine test, treadmill test, tuberculin skin test, tuberculin test, wassermann test, widal reaction, widal's test