Is there a term for "toilet" that isn't a euphemism?

By "toilet" I’m speaking of the thing upon which someone does their "business" — commode, throne, W.C., etc. Every synonym I can find is somehow a euphemism (as is "toilet", of course). And the same appears to be true (with the possible exception of "shithouse") for "toilet" when used to mean "rest room".

Are there any specific terms which are not simply euphemisms (and didn’t start as euphemisms) but specifically refer to the appliance or room?