ˈvī(ə)lˈfāliks- noun
or weil-felix test
Usage: usually capitalized W&F
Etymology: after Edmund Weil died 1922 and Arthur Felix died 1956 Austrian physicians
: an agglutination test for various rickettsial infections (as typhus fever and scrub typhus) using particular strains of bacteria of the genus Proteus that have antigens in common with the rickettsias to be identified