Dec 29, 2014 - I seem to recall that die Platte is more platter-like, larger, used for serving, and you eat off of der Teller. I could be wrong - it's been decades since I was in Germany.
Could this be translated "The wife has a plate."? Which I suppose would mean "my wife" -- I'm still trying to figure out this usage. Germans (or maybe just Duolingo), seem to be big on using definite article for relatives.