Ok, you got me.. i'll put it this way... in the eleven years since I started tech school and 20 years since I started learning about electronics, I've never once heard someone actually call them that, nor seen A/K* marked on a PCB, nor anode and cathode marked on the outside of such a capacitor.
I've seen hundreds of thousands of capacitors and PCBs marked with plus and minus, though.
Most techs will look at you funny if you say anode and cathode talking about a capacitor just the same as they would look at you funny if you talk about anodes and cathodes on batteries. It may be strictly accurate but you're never gonna see it.
* don't ask me why it is a K not a C. I guess nerds can't spell :roflmao: