plural petechiae, "small crimson or purple spots on skin," c.1795 (from 1580s in English texts as an Italian word), Modern Latin, from Italian petecchia "specks or freckles on the face," in plural form petecchie "measles," of unknown origin. Related: Petechial.
petechia pe·te·chi·a (pə-tē'kē-ə)
n. pl. pe·te·chi·ae (-kē-ī')
A small purplish spot on a body surface, such as the skin or a mucous membrane, caused by a minute hemorrhage and often seen in typhus.