Where does “tanfaen” come from?

tanfaen (Welsh) comes from Welsh tân, from Middle Welsh tan, from Proto-Brythonic tan, from Proto-Celtic teɸnets, from Proto-Indo-European tep- — to be warm, be hot.

tanfaen (Welsh): marcasite, sulfur pyrites

Definitions

  1. marcasite, sulfur pyrites

Ancestry of “tanfaen”, step by step

tanfaen traces back through two separate lines of ancestry.

via Welsh tân

StepLanguageWordMeaning
1Welshtânfire
2Middle Welshtan—
3Proto-Brythonictanunder; fire
4Proto-Celticteɸnetsfire
5Proto-Indo-Europeantep-to be warm, be hot

via Welsh maen

StepLanguageWordMeaning
1Welshmaenstone; griddle stone; third-person plural present...
2Proto-Brythonicmaɣɨnstone
3Proto-Celticmaginosstone; place
Every word from Proto-Indo-European tep- →Every word from Proto-Celtic teɸnets →Every word from Proto-Brythonic tan →