Where does “Twelfthtide” come from?

Twelfthtide (English) comes from English tide, from Middle English tyde, from Old English tīd, from Proto-Germanic tīdiz, from Proto-Indo-European déh₂itis, from Proto-Indo-European deh₂y-, from Proto-Indo-European deh₂- — to share, divide.

Twelfthtide (English): The season including Epiphany (the twelfth day after Christmas) and the evening of the preceding day (Twelfth Night), regarded as the end of the Christmas season; Epiphany itself

Definitions

  1. The season including Epiphany (the twelfth day after Christmas) and the evening of the preceding day (Twelfth Night), regarded as the end of the Christmas season; Epiphany itself

Ancestry of “Twelfthtide”, step by step

Twelfthtide traces back through two separate lines of ancestry.

via English tide

StepLanguageWordMeaning
1EnglishtideThe periodic change of the sea level,...
2Middle EnglishtydeA time (period), season
3Old Englishtīdtime, period, season; period, season, time;...
4Proto-Germanictīdiztime; period, interval
5Proto-Indo-Europeandéh₂itisinterval, period of time
6Proto-Indo-Europeandeh₂y-to share, divide
7Proto-Indo-Europeandeh₂-to share, divide

via English twelfth

StepLanguageWordMeaning
1EnglishtwelfthThe ordinal form of the number twelve, describing...
2Middle Englishtwelfthe
3Old Englishtwelftatwelfth
4Proto-Germanictwaliftôtwelfth
Every word from Proto-Indo-European deh₂-Every word from Proto-Indo-European deh₂y-Every word from Proto-Indo-European déh₂itis