Definition of subtertian in US English:

subtertian

adjective

Medicine
  • Designating a form of malaria that has a periodicity which deviates somewhat from that of ordinary tertian malaria (usually by a shortening of the time between paroxysms), specifically that caused by Plasmodium falciparum; characteristic of or causing this form of malaria. Now chiefly historical.

noun

Medicine
  • Subtertian malaria; specifically falciparum malaria. Now rare.

Origin

Mid 19th century. From sub- + tertian. Compare earlier semitertian and subintrant.

Pronunciation

subtertian

/ˌsʌbˈtəːʃn/