Where does “theta wave” come from?

theta wave (English) comes from English wave, from Middle English wawe, from Old English wǣġ, from Proto-Germanic wēgaz, from Proto-Indo-European weǵʰ- — to bring; to transport.

theta wave (English): A type of electrical activity in the brain; a...

Definitions

  1. A type of electrical activity in the brain; a...

Ancestry of “theta wave”, step by step

theta wave traces back through two separate lines of ancestry.

via English wave

StepLanguageWordMeaning
1EnglishwaveTo move back and forth repeatedly and somewhat...
2Middle EnglishwaweA wave; Any sort of flowing or spurting motion;...
3Old Englishwǣġa weight; a tool for weighing, balance, scale
4Proto-Germanicwēgazwave; sea
5Proto-Indo-Europeanweǵʰ-to bring; to transport

via English theta

StepLanguageWordMeaning
1EnglishthetaThe eighth letter of the Modern Greek alphabet,...
2Ancient Greekθῆταtheta, the name for the eighth letter Θ, θ of the...
3Phoenician𐤈‬
Every word from Proto-Indo-European weǵʰ-Every word from Proto-Germanic wēgazEvery word from Old English wǣġ
theta wave — Etymology, Origin & Word History | Etymology Explorer