Cold, chilly; freezing, frozen; frigid.

Originally: †(of a fever) characterized by paroxysms in which the stage of rigor is severe or prolonged; designating such a stage; (obsolete). In later use: (especially of forms of malaria and cholera) characterized by a (frequently terminal) stage in which the patient becomes cold and clammy as a result of hypovolaemic or septicaemic shock; designating this state; (also) having an abnormally low body temperature, especially as a result of shock.