• (n.) Chilliness; coldness • (n.) coldness and collapse.
Al·gid'i·ty noun Chilliness; coldness ; especially (Medicine) , coldness and collapse. 
algidity 1. A description of an episode during a severe fever when the patient's body temperature suddenly drops to an unusually low level. 2. Coldness, chilliness; especially, that which is caused by the collapse of vital bodily functions.