TERF stands for Trans Exclusionary Radical Feminist. Includes Germaine Greer and Andrea Dworkin, among others. A similar term is SWERF or Sex Worker exclusionary radical feminist. Includes Dworkin and Catherine McKinnon. I've often thought that there could also be a term for Sado Masochism Exclusionary Radical Feminist (Dworkin and McKinnon again) but pronouncing the acronym might detract from the seriousness of the issue.