Where does “heterotachy” come from?

heterotachy (English) comes from English hetero, from English heterosexual, from English -sexual, from English sexual, from Latin sexuālis, from Latin sexus, from Proto-Italic seksus, from Proto-Indo-European séksus — to cut, cut off, sever.

heterotachy (English): variability in the rate of genetic evolution over time

Definitions

  1. variability in the rate of genetic evolution over time

Ancestry of “heterotachy”, step by step

heterotachy traces back through two separate lines of ancestry.

via English hetero

StepLanguageWordMeaning
1EnglishheteroHeterosexual: of, pertaining to, or being a...
2EnglishheterosexualSexually attracted to members of the opposite...
3English-sexualForms a noun or adjective describing a state or...
4EnglishsexualArising from the fact of being male or female;...
5Latinsexuālissexual
6Latinsexusdivision; sex; gender
7Proto-Italicseksus
8Proto-Indo-Europeanséksus
9Proto-Indo-Europeansek-to cut, cut off, sever

via English tachy

StepLanguageWordMeaning
1EnglishtachyTachycardia; Tachypnoea
2Englishtachy-fast
3Ancient Greekταχύςswift, quick, fast, rapid; In a short time: soon
4Proto-Indo-Europeandʰn̥gʰ-
5Proto-Indo-Europeandʰengʰ-to cover; to overcast
Every word from Proto-Indo-European sek-