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Etymology · Ancient Greek

κατα-

2 English words descend from Ancient Greek κατα-, most common first.

cathodeAn electrode, of a cell or other electrically polarized device, through which a positive current of electricity flows outwards (and thus, electrons flow inwards). It can have either a negative or a positive voltage with respect to anode of the same polarized device (depending on whether the device is a load or a source, respectively).
scaffoldA structure made of scaffolding for workers to stand on while working on a building.