Planetdom

One day our System in its progress through space neared these lost Children of the Mist … such incorrigible vagrants, were enough to corrupt the habits of the staidest young family in Planetdom.

[...] yesterday, its members voted to drop Pluto from the ranks of planetdom.

What did the Chisters say when Ceres was demoted from planetdom back in the 19th century?

Back in the 19-th century the asteroid Ceres was demoted from planetdom.