English
hydrodiffusion
From hydro- + diffusion.
Formed from hydro- + diffusion
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ῡ̆̔́δωρ ‘water’
English hydro-
Proto-Indo-European *ǵʰewd- ‘to pour’
…
Proto-Italic *hundō ‘to pour out’
Latin fundō ‘to pour out, shed’
Latin diffundō ‘to diffuse, scatter’
Latin diffūsiō ‘spreading out, increase in extent or breadth’
English diffusion
Today it means
noun A form of steam distillation typically used to prepare essential oils
Language periods are conventional ranges, not dates for this word.
Etymograph / hydrodiffusion