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countable and uncountable, plural malarias
A disease spread by mosquito, in which a protozoan, Plasmodium, multiplies in blood every few days. examples
(archaic) Supposed poisonous air arising from marshy districts, once thought to cause fever. quotations
The doctor had his hands full, as the air was so impregnated with malaria that men who had only landed some twenty-four hours were laid low with this extraordinarily violent type of fever.
1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 149