English
hydroflask
From hydro- + flask.
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ῡ̆̔́δωρ ‘water’
English hydro-
Proto-Indo-European *ploḱ-skō ‘flat’
Proto-Germanic *flaskǭ ‘braid-covered bottle, wicker-enclosed jug’
Frankish *flaskā
Old English flasce ‘bottle, flask’
Middle English flask ‘case, cask, keg’
English flask
Today it means
noun A device for carrying out polymerization under pressure.
Language periods are conventional ranges, not dates for this word.
Etymograph / hydroflask