Etymology
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petechia (n.)

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," a word of unknown origin. Related: Petechial.

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Definitions of petechia

petechia (n.)
a minute red or purple spot on the surface of the skin as the result of tiny hemorrhages of blood vessels in the skin (as in typhoid fever);
From wordnet.princeton.edu