The final solution during World War Two was hitlers plan for mass extermination of the Jewish people by using the gas chambers where he could kill ultimately millions of Jews and other minorities.
Papaver means that it is a member of the Poppy genus when translated to English, while somniferum means "sleep-inducing". When translated from Latin to English, it basically means "the poppy that brings you sleep" or the "sleep inducing poppy", which is not that wrong considering that it is used to make opium.
