he·tae·ra 
(hĭ-tîrə) also he·tai·ra (-tīrə)
(hĭ-tîrə) also he·tai·ra (-tīrə)n. pl. he·tae·rae (-tîrē) or he·tae·ras also he·tai·rai (-tīrī′) or he·tai·ras
An ancient Greek courtesan or concubine, especially one who was highly educated or refined.
[Greek hetairā, feminine of hetairos, companion; see s(w)e- in the Appendix of Indo-European roots.]
he·taeric adj.