When Ellen deGeneres came out on TV, she said she was "gay." In current usage, the word applies to homosexuals of either gender. Don't feel bound by it though. If you prefer to use lesbian, queer, dyke (I don't mean this in a derogatory manner) or whatever, feel free. The English language is great like that, there is no one word for anything! Choose the one that you feel best describes what you prefer to be called.