a negatively charged electrode that is the source of electrons entering an electrical device
"When replacing the old battery in my flashlight, I realized I had swapped the positive and negative terminals because I confused which end was the cathode."
the positively charged terminal of a voltaic cell or storage battery that supplies current
"The old chemistry teacher pointed to the zinc electrode and explained that it acts as the cathode, the positive terminal where electrons flow out of our homemade voltaic cell."
An electrode, of a cell or other electrically polarized device, through which a positive current of electricity flows outwards (and thus, electrons flow inwards). It usually, but not always, has a positive voltage.
"The technician carefully connected the wire to the cathode to ensure that the positive current would flow outward from the battery during discharge."