You are my patronus.

It is this love that brings enough happiness, or joy if you will, (despite the new information) to produce a patronus.

James felt a little better seeing Merlin's ferocious Patronus, and he wasn't surprised at the form it had taken.

We geeks have a vested interest in raising our kids on the finer points of the Force and Patronus.

"Still casting your stag Patronus, eh Harry?" he inquired, slipping forward through the fog.

There is in Campton Church a tablet erected to Daniel Goldsmith, "Ecclesiae de Campton Pastor idem et Patronus;" also to Maria Goldsmith, "uxor dilectissima."