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knob (nob)

A protuberance; a mass; a nodule.
aortic k. the prominent shadow of the aortic arch on a frontal chest radiograph.
Engelmann's basal k.'s obsolete eponym for blepharoplast.
malarial k.'s rounded protrusions of a red blood cell infected with Plasmodium falciparum, responsible for the adhesion of infected red cells to one another and to the endothelium of the blood vessels containing these infected cells; results in capillary blockage responsible for much of the pathology of malignant tertian malaria.


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