lesbianism
Concise Oxford English Dictionary © 2008 Oxford University Press:
lesbian/ˈlezbiən/
▶noun a homosexual woman. ▶adjective relating to lesbians or lesbianism.
– derivatives
lesbianism noun.
lesbianism noun.
– origin C19: via L. from Gk Lesbios, from Lesbos, Greek island and home of Sappho, who expressed affection for women in her poetry, + -ian.
'lesbianism' also found in these Oxford entries:

