Where does “biseksuāls” come from?

biseksuāls (Latvian) comes from Latvian seksuāls, from Latvian sekss, from Latin sexus, from Proto-Italic seksus, from Proto-Indo-European séksus, from Proto-Indo-European sek- — to cut, cut off, sever.

Ancestry of “biseksuāls”, step by step

StepLanguageWordMeaning
1Latvianseksuālssexual; sexy
2Latvianseksssex, gender; sex
3Latinsexusdivision; sex; gender
4Proto-Italicseksus—
5Proto-Indo-Europeanséksus—
6Proto-Indo-Europeansek-to cut, cut off, sever
Every word from Proto-Indo-European sek- →Every word from Proto-Indo-European séksus →Every word from Proto-Italic seksus →