Source : Webster's Revised Unabridged Dictionary (1913)

Petechiae \Pe*tech"i*[ae]\, n. pl.; sing. {Petechia}. [NL., fr.
   LL. peteccia; cf. F. p['e]t['e]chie, It. petecchia, Sp.
   petequia, Gr. ? a label, plaster.] (Med.)
   Small crimson, purple, or livid spots, like flea-bites, due
   to extravasation of blood, which appear on the skin in
   malignant fevers, etc.

Source : WordNet®

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)
     [also: {petechiae} (pl)]