[f. prec. + -ITY, as if f. L. *algiditas. Cf. rigidity.] Coldness, chilliness; esp. that caused by collapse of the vital functions.
1656. Blount, Glossogr., Algidity, Algor, great cold or chilness.
1674. Coles, Lat. Dict., Algidity, algor.
1879. Syd. Soc. Lex., Algidity, a state of coldness and collapse.