Where does “tidal” come from?

Tidal comes from English tide, which derives from Proto-Germanic tīdiz meaning time or season, ultimately from Proto-Indo-European deh₂- meaning to divide.

tidal (English): relating to tides

Definitions

relating to tides

Ancestry of “tidal”, step by step

Step	Language	Word	Meaning
1	English	tide	The periodic change of the sea level,...
2	Middle English	tyde	—
3	Old English	tīd	time, period, season; period, season, time;...
4	Proto-Germanic	tīdiz	time; period, interval
5	Proto-Indo-European	déh₂itis	interval, period of time
6	Proto-Indo-European	deh₂y-	to share, divide
7	Proto-Indo-European	deh₂-	to share, divide

Words derived from “tidal”

intertidal
subtidal
tidally
supratidal
microtidal
macrotidal
mesotidal
nontidal
cotidal
subtidally
intertidally
tidalite
extratidal
intercotidale
cotidale
cotidal

Every word from Proto-Indo-European deh₂- →

tidal — Etymology, Origin & Word History | Etymology Explorer