The respective term is trans-gender not “tranny”, which is an actual slur now only used by bigots and transphobe porn addicts . In Latin ‘cis’ is to ‘trans’ the opposite proposition (not pronoun in case some idiot republican bigot misses the nuance here). It is an established term in medical and psychological journals, which as with transgender and non-binary people organizations are conveniently left out of this TERF and nazi fueled culture war we are witnessing. https://www.apa.org/practice/guidelines/transgender.pdf https://www.apa.org/monitor/2018/09/ce-corner-glossary https://www.psychiatry.org/patients-families/gender-dysphoria https://www.who.int/health-topics/gender