dem·i·monde 
(dĕmē-mŏnd′)
(dĕmē-mŏnd′)n.
1.
a. A class of women supported by wealthy lovers and considered to be promiscuous or otherwise unrespectable.
b. Women prostitutes considered as a group.
2. A group whose respectability is dubious: the literary demimonde of ghostwriters, hacks, and publicists. Also called demiworld.
[French demi-monde : demi-, demi- + monde, world (from Latin mundus).]