hetaera
noun
he·tae·ra hi-ˈtir-ə 
variants or hetaira
hi-ˈtī-rə
plural hetaerae hi-ˈtir-(ˌ)ē or hetaeras or hetairas or hetairai hi-ˈtī-ˌrī
or hetaeras or hetairas or hetairai hi-ˈtī-ˌrī 1
: one of a class of highly cultivated courtesans in ancient Greece
2
: demimondaine
Word History
Etymology
Greek hetaira, literally, companion, feminine of hetairos
First Known Use
1820, in the meaning defined at sense 1