Plural of TERF.
Trans-Exclusionary Radical Feminists. That group of feminists that claims that trans women aren't really women, as biological determinism is only a fallacy when it used against them, not when they use it against others.
Western Feminism has killed trans women. With books and writings by TERFs like Mary Daly and Janice Raymond, feminism in the west has resulted in the denial of necessary medical care to ungodly numbers of trans women, especially transitional surgeries, hormones and aid. Denial of access to resources for trans women rape survivors, abuse survivors and the homeless and impoverished. Which resulted in deaths. Horrifying numbers of deaths.