sapphism
noun
sap·phism ˈsa-ˌfi-zəm 
: lesbianism
Example Sentences
Recent Examples on the Web Most of the women who come for an evening of unabashed sapphism with Skirt Club identify as straight, says LeJeune, a former Bloomberg journalist currently married to a man. 
Wednesday Martin, The Hollywood Reporter, 9 June 2017
Wednesday Martin, The Hollywood Reporter, 9 June 2017 Word History
Etymology
Sappho + -ism; from the belief that Sappho was sexually attracted to other women
First Known Use
circa 1890, in the meaning defined above
Medical Definition
sapphism
noun
sap·phism ˈsaf-ˌiz-əm
: lesbianism