English

flexitank

From a brand name.

Latin flectō ‘to bend, curve’

Latin flexibilis ‘flexible, pliant, able to be bent’

Middle French flexible

Portuguese tanque ‘tank, liquid container’

English tank

Today it means

noun A liquid storage container made from flexible material such as polyurethane.

Language periods are conventional ranges, not dates for this word.

Etymograph / flexitank