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.