courtesan
Concise Oxford English Dictionary © 2008 Oxford University Press:
courtesan /ˌkɔːtɪˈzan, ˈkɔːtɪ-/
▶noun a prostitute, especially one with wealthy or upper-class clients.
– origin C16: from Fr. courtisane, from obs. Ital. cortigiana, fem. of cortigiano ‘courtier’.
'courtesan' also found in these Oxford entries:

