Where does “tremour” come from?

tremour (Anglo-Norman) comes from Old French tremor, from Latin tremor, from Latin tremō, from Proto-Italic tremō, from Proto-Indo-European trem-, from Proto-Indo-European ter-, from Italian termine, from Latin terminus — boundary, end.

Ancestry of “tremour”, step by step

StepLanguageWordMeaning
1Old Frenchtremorterror; great fear
2Latintremortrembling, quaking, tremor; first-person singular...
3Latintremōto tremble, shake, shudder at
4Proto-Italictremō
5Proto-Indo-Europeantrem-to tremble
6Proto-Indo-Europeanter-tender, weak; young creature
7Italiantermineend, close; limit, term, date, time; term, word
8Latinterminusa boundary, limit, end
9Proto-Italictermenos
10Proto-Indo-Europeantérmn̥boundary, end

Words derived from “tremour

Every word from Proto-Indo-European térmn̥Every word from Proto-Italic termenosEvery word from Proto-Indo-European ter-