Wi·dal test 
(vē-däl)
(vē-däl)n.
A test of blood serum that uses an agglutination reaction to diagnose typhoid fever.
[After Fernand Widal (1862-1929), French physician.]
- protonemal
- protonematal
- protonic
- protonotary
- protonotary
- protonotary apostolic
- proton-proton chain
- proton pump inhibitor
- proton synchrotron
- proto-oncogene
- protopathic
- protopathy
- protoplanet
- protoplanetary disk
- protoplasm
- protoplasmal
- protoplasmatic
- protoplasmic
- protoplast
- protoplastic
- protoporphyrin
- protostar
- protostele
- protostelic
- protostome